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Available in 16 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-16" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">16 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Is%C3%B2tops_del_t%C3%A0ntal" title="Isòtops del tàntal – Catalan" lang="ca" hreflang="ca" data-title="Isòtops del tàntal" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A2%D0%B0%D0%BD%D1%82%D0%B0%D0%BB_%D0%B8%D0%B7%D0%BE%D1%82%D0%BE%D0%BF%C4%95%D1%81%D0%B5%D0%BC" title="Тантал изотопĕсем – Chuvash" lang="cv" hreflang="cv" data-title="Тантал изотопĕсем" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Izotopy_tantalu" title="Izotopy tantalu – Czech" lang="cs" hreflang="cs" data-title="Izotopy tantalu" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Anexo:Is%C3%B3topos_de_t%C3%A1ntalo" title="Anexo:Isótopos de tántalo – Spanish" lang="es" hreflang="es" data-title="Anexo:Isótopos de tántalo" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Izotopoj_de_tantalo" title="Izotopoj de tantalo – Esperanto" lang="eo" hreflang="eo" data-title="Izotopoj de tantalo" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%DB%8C%D8%B2%D9%88%D8%AA%D9%88%D9%BE%E2%80%8C%D9%87%D8%A7%DB%8C_%D8%AA%D8%A7%D9%86%D8%AA%D8%A7%D9%84" title="ایزوتوپ‌های تانتال – Persian" lang="fa" hreflang="fa" data-title="ایزوتوپ‌های تانتال" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Isotopes_du_tantale" title="Isotopes du tantale – French" lang="fr" hreflang="fr" data-title="Isotopes du tantale" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%83%84%ED%83%88%EB%9F%BC_%EB%8F%99%EC%9C%84_%EC%9B%90%EC%86%8C" title="탄탈럼 동위 원소 – Korean" lang="ko" hreflang="ko" data-title="탄탈럼 동위 원소" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Isotop_tantalum" title="Isotop tantalum – Indonesian" lang="id" hreflang="id" data-title="Isotop tantalum" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/A_tant%C3%A1l_izot%C3%B3pjai" title="A tantál izotópjai – Hungarian" lang="hu" hreflang="hu" data-title="A tantál izotópjai" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Isotopen_van_tantaal" title="Isotopen van tantaal – Dutch" lang="nl" hreflang="nl" data-title="Isotopen van tantaal" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%BF%E3%83%B3%E3%82%BF%E3%83%AB%E3%81%AE%E5%90%8C%E4%BD%8D%E4%BD%93" title="タンタルの同位体 – Japanese" lang="ja" hreflang="ja" data-title="タンタルの同位体" data-language-autonym="日本語" data-language-local-name="Japanese" 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data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><caption class="infobox-title"><span class="nowrap"><a href="/wiki/Isotope" title="Isotope">Isotopes</a> of <a href="/wiki/Tantalum" title="Tantalum">tantalum</a> <style data-mw-deduplicate="TemplateStyles:r886047488">.mw-parser-output .nobold{font-weight:normal}</style><span class="nobold">(<sub>73</sub>Ta)</span></span></caption><tbody><tr><td colspan="2" class="infobox-full-data"> <table class="wikitable" style="text-align: center; vertical-align: middle; width: 100%; border-collapse: collapse; margin: 0; padding: 0;"> <tbody><tr> <th colspan="3">Main isotopes<sup id="cite_ref-NUBASE2020_1-0" class="reference"><a href="#cite_note-NUBASE2020-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </th> <th colspan="2"><a href="/wiki/Radioactive_decay" title="Radioactive decay">Decay</a> </th></tr> <tr> <th> </th> <th style="padding: 0.1em;"><a href="/wiki/Natural_abundance" title="Natural abundance">abundance</a> </th> <th style="padding: 0.1em;"><a href="/wiki/Half-life" title="Half-life">half-life</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886047488"><span class="nobold">(<i>t</i><sub>1/2</sub>)</span> </th> <th style="padding: 0.1em;"><a href="/wiki/Radioactive_decay#Types_of_decay" title="Radioactive decay">mode</a> </th> <th style="padding: 0.1em;"><a href="/wiki/Decay_product" title="Decay product">product</a> </th></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>177</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: center;"><a href="/wiki/Synthetic_radioisotope" title="Synthetic radioisotope">synth</a> </td> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7005203616000000000♠"></span>56.56 h</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;"><a href="/wiki/Beta_plus_decay" class="mw-redirect" title="Beta plus decay">β<sup>+</sup></a></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Hafnium-177" class="mw-redirect" title="Hafnium-177"><sup>177</sup>Hf</a> </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>178</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: center;">synth </td> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7003849600000000000♠"></span>2.36 h</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;">β<sup>+</sup></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Hafnium-178" class="mw-redirect" title="Hafnium-178"><sup>178</sup>Hf</a> </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>179</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: center;">synth </td> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7007574348320000000♠"></span>1.82 y</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;"><a href="/wiki/Electron_capture" title="Electron capture">ε</a></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Hafnium-179" class="mw-redirect" title="Hafnium-179"><sup>179</sup>Hf</a> </td></tr> <tr> <th rowspan="2" style="vertical-align: top;"><sup>180</sup>Ta </th> <td rowspan="2" colspan="1" style="vertical-align: top; text-align: center;">synth </td> <td rowspan="2" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7004292500000000000♠"></span>8.125 h</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;">ε</span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Hafnium-180" class="mw-redirect" title="Hafnium-180"><sup>180</sup>Hf</a> </td></tr> <tr> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;"><a href="/wiki/Beta_minus_decay" class="mw-redirect" title="Beta minus decay">β<sup>−</sup></a></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Tungsten-180" class="mw-redirect" title="Tungsten-180"><sup>180</sup>W</a> </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>180m</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;">0.0120% </td> <td rowspan="1" colspan="3" style="vertical-align: top; text-align: left;"><a href="/wiki/Stable_isotope" class="mw-redirect" title="Stable isotope">stable</a> </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>181</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="6999999880000000000♠"></span>99.988%</span> </td> <td rowspan="1" colspan="3" style="vertical-align: top; text-align: left;">stable </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>182</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: center;">synth </td> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7006988675200000000♠"></span>114.43 d</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;">β<sup>−</sup></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Tungsten-182" class="mw-redirect" title="Tungsten-182"><sup>182</sup>W</a> </td></tr> <tr> <th rowspan="1" style="vertical-align: top;"><sup>183</sup>Ta </th> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: center;">synth </td> <td rowspan="1" colspan="1" style="vertical-align: top; text-align: right;"><span class="nowrap"><span data-sort-value="7005440639999999999♠"></span>5.1 d</span> </td> <td style="text-align: left; vertical-align: top;"><span style="float: left; font-size: 115%; padding: 0;">β<sup>−</sup></span><span style="float: right; padding-left: 0.2em;"></span> </td> <td style="text-align: right; vertical-align: middle;"><a href="/wiki/Tungsten-183" class="mw-redirect" title="Tungsten-183"><sup>183</sup>W</a> </td></tr></tbody></table></td></tr><tr><th colspan="2" class="infobox-header" style="background: #e0e0e0;"><a href="/wiki/Standard_atomic_weight" title="Standard atomic weight">Standard atomic weight</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886047488"><span class="nobold"><i>A</i><sub>r</sub>°(Ta)</span></th></tr><tr><th scope="row" class="infobox-label"></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span class="nowrap"><span data-sort-value="7002180947880000000♠"></span>180.947<span style="margin-left:.25em;">88</span><span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.000<span style="margin-left:.25em;">02</span></span><sup id="cite_ref-CIAAW_2-0" class="reference"><a href="#cite_note-CIAAW-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li><li><span class="nowrap"><span data-sort-value="7002180950000000000♠"></span>180.95<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.01</span> (<a href="/wiki/Standard_atomic_weight#Abridged_atomic_weight" title="Standard atomic weight">abridged</a>)<sup id="cite_ref-CIAAW2021_3-0" class="reference"><a href="#cite_note-CIAAW2021-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></li></ul></div></td></tr><tr><td colspan="2" class="infobox-below noprint" style="background: #e8e8e8;"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist"><ul><li class="nv-view"><a href="/wiki/Template:Infobox_tantalum_isotopes" title="Template:Infobox tantalum isotopes"><span title="View this template">view</span></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Infobox_tantalum_isotopes" class="mw-redirect" title="Template talk:Infobox tantalum isotopes"><span title="Discuss this template">talk</span></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Infobox_tantalum_isotopes" title="Special:EditPage/Template:Infobox tantalum isotopes"><span title="Edit this template">edit</span></a></li></ul></div></td></tr></tbody></table> <p>Natural <a href="/wiki/Tantalum" title="Tantalum">tantalum</a> (<sub>73</sub>Ta) consists of two stable <a href="/wiki/Isotope" title="Isotope">isotopes</a>: <sup>181</sup>Ta (99.988%) and <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180m</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> (0.012%). </p><p>There are also 35 known artificial <a href="/wiki/Radioisotope" class="mw-redirect" title="Radioisotope">radioisotopes</a>, the longest-lived of which are <sup>179</sup>Ta with a half-life of 1.82 years, <sup>182</sup>Ta with a half-life of 114.43 days, <sup>183</sup>Ta with a half-life of 5.1 days, and <sup>177</sup>Ta with a half-life of 56.56 hours. All other isotopes have half-lives under a day, most under an hour. There are also numerous isomers, the most stable of which (other than <sup>180m</sup>Ta) is <sup>178m1</sup>Ta with a half-life of 2.36 hours. All isotopes and <a href="/wiki/Nuclear_isomers" class="mw-redirect" title="Nuclear isomers">nuclear isomers</a> of tantalum are either radioactive or <a href="/wiki/Observationally_stable" class="mw-redirect" title="Observationally stable">observationally stable</a>, meaning that they are predicted to be radioactive but no actual decay has been observed. </p><p>Tantalum has been proposed as a "<a href="/wiki/Salted_bomb" title="Salted bomb">salting</a>" material for <a href="/wiki/Nuclear_weapon" title="Nuclear weapon">nuclear weapons</a> (<a href="/wiki/Cobalt" title="Cobalt">cobalt</a> is another, better-known salting material). A jacket of <sup>181</sup>Ta, irradiated by the intense high-energy neutron flux from an exploding thermonuclear weapon, would transmute into the radioactive isotope <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">182</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> with a <a href="/wiki/Half-life" title="Half-life">half-life</a> of 114.43 days and produce approximately 1.12 <a href="/wiki/MeV" class="mw-redirect" title="MeV">MeV</a> of <a href="/wiki/Gamma_ray" title="Gamma ray">gamma radiation</a>, significantly increasing the radioactivity of the weapon's <a href="/wiki/Nuclear_fallout" title="Nuclear fallout">fallout</a> for several months. Such a weapon is not known to have ever been built, tested, or used.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> While the conversion factor from <a href="/wiki/Absorbed_dose" title="Absorbed dose">absorbed dose</a> (measured in <a href="/wiki/Gray_(unit)" title="Gray (unit)">Grays</a>) to <a href="/wiki/Effective_dose_(radiation)" title="Effective dose (radiation)">effective dose</a> (measured in <a href="/wiki/Sievert_(unit)" class="mw-redirect" title="Sievert (unit)">Sievert</a>) for gamma rays is 1 while it is 50 for alpha radiation (i.e., a gamma dose of 1 Gray is equivalent to 1 Sievert whereas an alpha dose of 1 Gray is equivalent to 50 Sievert), gamma rays are only <a href="/wiki/Attenuation" title="Attenuation">attenuated</a> by shielding, not stopped. As such, alpha particles require incorporation to have an effect while gamma rays can have an effect via mere proximity. In military terms, this allows a gamma ray weapon to <a href="/wiki/Area_denial" class="mw-redirect" title="Area denial">deny an area</a> to either side as long as the dose is high enough, whereas <a href="/wiki/Radioactive_contamination" title="Radioactive contamination">radioactive contamination</a> by alpha emitters which do not release significant amounts of gamma rays can be counteracted by ensuring the material is not incorporated. </p> <div class="mw-heading mw-heading2"><h2 id="List_of_isotopes">List of isotopes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Isotopes_of_tantalum&action=edit&section=1" title="Edit section: List of isotopes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable sortable" style="font-size: 85%; white-space: nowrap"> <tbody><tr style="vertical-align: top"> <th rowspan="2">Nuclide<br /><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>n 1<span class="cite-bracket">]</span></a></sup> </th> <th rowspan="1"><a href="/wiki/Atomic_number" title="Atomic number"><i>Z</i></a> </th> <th rowspan="1"><a href="/wiki/Neutron_number" title="Neutron number"><i>N</i></a> </th> <th rowspan="1"><a href="/wiki/Atomic_mass" title="Atomic mass">Isotopic mass</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886047488"><span class="nobold">(<a href="/wiki/Dalton_(unit)" title="Dalton (unit)">Da</a>)</span><sup id="cite_ref-AME2020_II_6-0" class="reference"><a href="#cite_note-AME2020_II-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><br /><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>n 2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-TMS_8-0" class="reference"><a href="#cite_note-TMS-8"><span class="cite-bracket">[</span>n 3<span class="cite-bracket">]</span></a></sup> </th> <th rowspan="2"><a href="/wiki/Half-life" title="Half-life">Half-life</a><sup id="cite_ref-NUBASE2020_1-1" class="reference"><a href="#cite_note-NUBASE2020-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><br /><sup id="cite_ref-TNN_9-0" class="reference"><a href="#cite_note-TNN-9"><span class="cite-bracket">[</span>n 4<span class="cite-bracket">]</span></a></sup> </th> <th rowspan="2"><a href="/wiki/Decay_mode" class="mw-redirect" title="Decay mode">Decay<br />mode</a><sup id="cite_ref-NUBASE2020_1-2" class="reference"><a href="#cite_note-NUBASE2020-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><br /><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>n 5<span class="cite-bracket">]</span></a></sup> </th> <th rowspan="2"><a href="/wiki/Decay_product" title="Decay product">Daughter<br />isotope</a><br /><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>n 6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>n 7<span class="cite-bracket">]</span></a></sup> </th> <th rowspan="2"><a href="/wiki/Spin_(particle_physics)" class="mw-redirect" title="Spin (particle physics)">Spin</a> and<br /><a href="/wiki/Parity_(physics)#Nuclei" title="Parity (physics)">parity</a><sup id="cite_ref-NUBASE2020_1-3" class="reference"><a href="#cite_note-NUBASE2020-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><br /><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>n 8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-TNN_9-1" class="reference"><a href="#cite_note-TNN-9"><span class="cite-bracket">[</span>n 4<span class="cite-bracket">]</span></a></sup> </th> <th colspan="2"><a href="/wiki/Natural_abundance" title="Natural abundance">Natural abundance</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886047488"><span class="nobold">(mole fraction)</span> </th></tr> <tr> <th colspan="3">Excitation energy<sup id="cite_ref-TNN_9-2" class="reference"><a href="#cite_note-TNN-9"><span class="cite-bracket">[</span>n 4<span class="cite-bracket">]</span></a></sup> </th> <th>Normal proportion<sup id="cite_ref-NUBASE2020_1-4" class="reference"><a href="#cite_note-NUBASE2020-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </th> <th>Range of variation </th></tr> <tr id="Tantalum-155"> <td><sup>155</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">82 </td> <td>154.97425(32)# </td> <td>3.2(13) ms </td> <td><a href="/wiki/Proton_emission" title="Proton emission">p</a> </td> <td><sup>154</sup>Hf </td> <td>11/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-156"> <td rowspan="2"><sup>156</sup>Ta </td> <td rowspan="2" style="text-align:right">73 </td> <td rowspan="2" style="text-align:right">83 </td> <td rowspan="2">155 97209(32)# </td> <td rowspan="2">106(4) ms </td> <td>p (71%) </td> <td><sup>155</sup>Hf </td> <td rowspan="2">(2−) </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td><a href="/wiki/Beta_decay" title="Beta decay">β<sup>+</sup></a> (29%) </td> <td><sup>156</sup>Hf </td></tr> <tr id="Tantalum-156m"> <td rowspan="2" style="text-indent:1em"><sup>156m</sup>Ta </td> <td rowspan="2" colspan="3" style="text-indent:2em">94(8) keV </td> <td rowspan="2">360(40) ms </td> <td>β<sup>+</sup> (95.8%) </td> <td><sup>156</sup>Hf </td> <td rowspan="2">(9+) </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>p (4.2%) </td> <td><sup>155</sup>Hf </td></tr> <tr id="Tantalum-157"> <td rowspan="2"><sup>157</sup>Ta </td> <td rowspan="2" style="text-align:right">73 </td> <td rowspan="2" style="text-align:right">84 </td> <td rowspan="2">156.96823(16) </td> <td rowspan="2">10.1(4) ms </td> <td><a href="/wiki/Alpha_decay" title="Alpha decay">α</a> (96.6%) </td> <td><sup>153</sup>Lu </td> <td rowspan="2">1/2+ </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>p (3.4%) </td> <td><sup>156</sup>Hf </td></tr> <tr id="Tantalum-157m1"> <td style="text-indent:1em"><sup>157m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">22(5) keV </td> <td>4.3(1) ms </td> <td>α </td> <td><sup>153</sup>Lu </td> <td>11/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-157m2"> <td style="text-indent:1em"><sup>157m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1593(9) keV </td> <td>1.7(1) ms </td> <td>α </td> <td><sup>153</sup>Lu </td> <td>25/2−# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-158"> <td><sup>158</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">85 </td> <td>157.96659(22)# </td> <td>49(4) ms </td> <td>α </td> <td><sup>154</sup>Lu </td> <td>(2)− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-158m1"> <td style="text-indent:1em"><sup>158m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">141(11) keV </td> <td>36.0(8) ms </td> <td>α (95%) </td> <td><sup>154</sup>Lu </td> <td>(9)+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-158m2"> <td rowspan="2" style="text-indent:1em"><sup>158m2</sup>Ta </td> <td rowspan="2" colspan="3" style="text-indent:2em">2808(16) keV </td> <td rowspan="2">6.1(1) μs </td> <td><a href="/wiki/Isomeric_transition" class="mw-redirect" title="Isomeric transition">IT</a> (98.6%) </td> <td><sup>158</sup>Ta </td> <td rowspan="2">(19−) </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>α (1.4%) </td> <td><sup>154</sup>Lu </td></tr> <tr id="Tantalum-159"> <td rowspan="2"><sup>159</sup>Ta </td> <td rowspan="2" style="text-align:right">73 </td> <td rowspan="2" style="text-align:right">86 </td> <td rowspan="2">158.963028(21) </td> <td rowspan="2">1.04(9) s </td> <td>β<sup>+</sup> (66%) </td> <td><sup>159</sup>Hf </td> <td rowspan="2">1/2+ </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>α (34%) </td> <td><sup>155</sup>Lu </td></tr> <tr id="Tantalum-159m"> <td rowspan="2" style="text-indent:1em"><sup>159m</sup>Ta </td> <td rowspan="2" colspan="3" style="text-indent:2em">64(5) keV </td> <td rowspan="2">560(60) ms </td> <td>α (55%) </td> <td><sup>155</sup>Lu </td> <td rowspan="2">11/2− </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>β<sup>+</sup> (45%) </td> <td><sup>159</sup>Hf </td></tr> <tr id="Tantalum-160"> <td><sup>160</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">87 </td> <td>159.961542(58) </td> <td>1.70(20) s </td> <td>α </td> <td><sup>156</sup>Lu </td> <td>(2)− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-160m"> <td style="text-indent:1em"><sup>160m</sup>Ta<sup id="cite_ref-order_14-0" class="reference"><a href="#cite_note-order-14"><span class="cite-bracket">[</span>n 9<span class="cite-bracket">]</span></a></sup> </td> <td colspan="3" style="text-indent:2em">110(250) keV </td> <td>1.55(4) s </td> <td>α </td> <td><sup>156</sup>Lu </td> <td>(9,10)+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-161"> <td><sup>161</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">88 </td> <td>160.958369(26) </td> <td>3# s </td> <td> </td> <td> </td> <td>(1/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-161m"> <td rowspan="2" style="text-indent:1em"><sup>161m</sup>Ta<sup id="cite_ref-order_14-1" class="reference"><a href="#cite_note-order-14"><span class="cite-bracket">[</span>n 9<span class="cite-bracket">]</span></a></sup> </td> <td rowspan="2" colspan="3" style="text-indent:2em">61(23) keV </td> <td rowspan="2">3.08(11) s </td> <td>β<sup>+</sup> (93%) </td> <td><sup>161</sup>Hf </td> <td rowspan="2">(11/2−) </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>α (7%) </td> <td><sup>157</sup>Lu </td></tr> <tr id="Tantalum-162"> <td rowspan="2"><sup>162</sup>Ta </td> <td rowspan="2" style="text-align:right">73 </td> <td rowspan="2" style="text-align:right">89 </td> <td rowspan="2">161.957293(68) </td> <td rowspan="2">3.57(12) s </td> <td>β<sup>+</sup> (99.93%) </td> <td><sup>162</sup>Hf </td> <td rowspan="2">3−# </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>α (0.074%) </td> <td><sup>158</sup>Lu </td></tr> <tr id="Tantalum-162m"> <td style="text-indent:1em"><sup>162m</sup>Ta<sup id="cite_ref-order_14-2" class="reference"><a href="#cite_note-order-14"><span class="cite-bracket">[</span>n 9<span class="cite-bracket">]</span></a></sup> </td> <td colspan="3" style="text-indent:2em">120(50)# keV </td> <td>5# s </td> <td> </td> <td> </td> <td>7+# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-163"> <td><sup>163</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">90 </td> <td>162.954337(41) </td> <td>10.6(18) s </td> <td>β<sup>+</sup> (99.8%) </td> <td><sup>163</sup>Hf </td> <td>1/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-163m"> <td style="text-indent:1em"><sup>163m</sup>Ta </td> <td colspan="3" style="text-indent:2em">138(18)# keV </td> <td>10# s </td> <td> </td> <td> </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-164"> <td><sup>164</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">91 </td> <td>163.953534(30) </td> <td>14.2(3) s </td> <td>β<sup>+</sup> </td> <td><sup>164</sup>Hf </td> <td>(3+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-165"> <td><sup>165</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">92 </td> <td>164.950780(15) </td> <td>31.0(15) s </td> <td>β<sup>+</sup> </td> <td><sup>165</sup>Hf </td> <td>(1/2+,3/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-165m"> <td style="text-indent:1em"><sup>165m</sup>Ta<sup id="cite_ref-order_14-3" class="reference"><a href="#cite_note-order-14"><span class="cite-bracket">[</span>n 9<span class="cite-bracket">]</span></a></sup> </td> <td colspan="3" style="text-indent:2em">24(18) keV </td> <td>30# s </td> <td> </td> <td> </td> <td>(9/2−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-166"> <td><sup>166</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">93 </td> <td>165.950512(30) </td> <td>34.4(5) s </td> <td>β<sup>+</sup> </td> <td><sup>166</sup>Hf </td> <td>(2)+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-167"> <td><sup>167</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">94 </td> <td>166.948093(30) </td> <td>1.33(7) min </td> <td>β<sup>+</sup> </td> <td><sup>167</sup>Hf </td> <td>(3/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-168"> <td><sup>168</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">95 </td> <td>167.948047(30) </td> <td>2.0(1) min </td> <td>β<sup>+</sup> </td> <td><sup>168</sup>Hf </td> <td>(3+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-169"> <td><sup>169</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">96 </td> <td>168.946011(30) </td> <td>4.9(4) min </td> <td>β<sup>+</sup> </td> <td><sup>169</sup>Hf </td> <td>(5/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-170"> <td><sup>170</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">97 </td> <td>169.946175(30) </td> <td>6.76(6) min </td> <td>β<sup>+</sup> </td> <td><sup>170</sup>Hf </td> <td>(3+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-171"> <td><sup>171</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">98 </td> <td>170.944476(30) </td> <td>23.3(3) min </td> <td>β<sup>+</sup> </td> <td><sup>171</sup>Hf </td> <td>(5/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-172"> <td><sup>172</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">99 </td> <td>171.944895(30) </td> <td>36.8(3) min </td> <td>β<sup>+</sup> </td> <td><sup>172</sup>Hf </td> <td>(3+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-173"> <td><sup>173</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">100 </td> <td>172.943750(30) </td> <td>3.14(13) h </td> <td>β<sup>+</sup> </td> <td><sup>173</sup>Hf </td> <td>5/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-173m1"> <td style="text-indent:1em"><sup>173m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">173.10(21) keV </td> <td>205.2(56) ns </td> <td>IT </td> <td><sup>173</sup>Ta </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-173m2"> <td style="text-indent:1em"><sup>173m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">1717.2(4) keV </td> <td>132(3) ns </td> <td>IT </td> <td><sup>173</sup>Ta </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-174"> <td><sup>174</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">101 </td> <td>173.944454(30) </td> <td>1.14(8) h </td> <td>β<sup>+</sup> </td> <td><i><b><sup>174</sup>Hf</b></i> </td> <td>3+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-175"> <td><sup>175</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">102 </td> <td>174.943737(30) </td> <td>10.5(2) h </td> <td>β<sup>+</sup> </td> <td><sup>175</sup>Hf </td> <td>7/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-175m1"> <td style="text-indent:1em"><sup>175m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">131.41(17) keV </td> <td>222(8) ns </td> <td>IT </td> <td><sup>175</sup>Ta </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-175m2"> <td style="text-indent:1em"><sup>175m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">339.2(13) keV </td> <td>170(20) ns </td> <td>IT </td> <td><sup>175</sup>Ta </td> <td>(1/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-175m3"> <td style="text-indent:1em"><sup>175m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">1567.6(3) keV </td> <td>1.95(15) μs </td> <td>IT </td> <td><sup>175</sup>Ta </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-176"> <td><sup>176</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">103 </td> <td>175.944857(33) </td> <td>8.09(5) h </td> <td>β<sup>+</sup> </td> <td><b><sup>176</sup>Hf</b> </td> <td>(1)− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-176m1"> <td style="text-indent:1em"><sup>176m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">103.0(10) keV </td> <td>1.08(7) ms </td> <td>IT </td> <td><sup>176</sup>Ta </td> <td>7+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-176m2"> <td style="text-indent:1em"><sup>176m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1474.0(14) keV </td> <td>3.8(4) μs </td> <td>IT </td> <td><sup>176</sup>Ta </td> <td>14− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-176m3"> <td style="text-indent:1em"><sup>176m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">2874.0(14) keV </td> <td>0.97(7) ms </td> <td>IT </td> <td><sup>176</sup>Ta </td> <td>20− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-177"> <td><sup>177</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">104 </td> <td>176.9444819(36) </td> <td>56.36(13) h </td> <td>β<sup>+</sup> </td> <td><b><sup>177</sup>Hf</b> </td> <td>7/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-177m1"> <td style="text-indent:1em"><sup>177m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">73.16(7) keV </td> <td>410(7) ns </td> <td>IT </td> <td><sup>177</sup>Ta </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-177m2"> <td style="text-indent:1em"><sup>177m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">186.16(6) keV </td> <td>3.62(10) μs </td> <td>IT </td> <td><sup>177</sup>Ta </td> <td>5/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-177m3"> <td style="text-indent:1em"><sup>177m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">1354.8(3) keV </td> <td>5.30(11) μs </td> <td>IT </td> <td><sup>177</sup>Ta </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-177m4"> <td style="text-indent:1em"><sup>177m4</sup>Ta </td> <td colspan="3" style="text-indent:2em">4656.3(8) keV </td> <td>133(4) μs </td> <td>IT </td> <td><sup>177</sup>Ta </td> <td>49/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-178"> <td><sup>178</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">105 </td> <td>177.945680(56)# </td> <td>2.36(8) h </td> <td>β<sup>+</sup> </td> <td><b><sup>178</sup>Hf</b> </td> <td>7− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-178m1"> <td style="text-indent:1em"><sup>178m1</sup>Ta<sup id="cite_ref-order_14-4" class="reference"><a href="#cite_note-order-14"><span class="cite-bracket">[</span>n 9<span class="cite-bracket">]</span></a></sup> </td> <td colspan="3" style="text-indent:2em">100(50)# keV </td> <td>9.31(3) min </td> <td>β<sup>+</sup> </td> <td><b><sup>178</sup>Hf</b> </td> <td>(1+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-178m2"> <td style="text-indent:1em"><sup>178m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1467.82(16) keV </td> <td>59(3) ms </td> <td>IT </td> <td><sup>178</sup>Ta </td> <td>15− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-178m3"> <td style="text-indent:1em"><sup>178m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">2901.9(7) keV </td> <td>290(12) ms </td> <td>IT </td> <td><sup>178</sup>Ta </td> <td>21− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179"> <td><sup>179</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">106 </td> <td>178.9459391(16) </td> <td>1.82(3) y </td> <td><a href="/wiki/Electron_capture" title="Electron capture">EC</a> </td> <td><b><sup>179</sup>Hf</b> </td> <td>7/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m1"> <td style="text-indent:1em"><sup>179m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">30.7(1) keV </td> <td>1.42(8) μs </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m2"> <td style="text-indent:1em"><sup>179m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">520.23(18) keV </td> <td>280(80) ns </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>1/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m3"> <td style="text-indent:1em"><sup>179m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">1252.60(23) keV </td> <td>322(16) ns </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m4"> <td style="text-indent:1em"><sup>179m4</sup>Ta </td> <td colspan="3" style="text-indent:2em">1317.2(4) keV </td> <td>9.0(2) ms </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>25/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m5"> <td style="text-indent:1em"><sup>179m5</sup>Ta </td> <td colspan="3" style="text-indent:2em">1328.0(4) keV </td> <td>1.6(4) μs </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>23/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-179m6"> <td style="text-indent:1em"><sup>179m6</sup>Ta </td> <td colspan="3" style="text-indent:2em">2639.3(5) keV </td> <td>54.1(17) ms </td> <td>IT </td> <td><sup>179</sup>Ta </td> <td>37/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-180"> <td rowspan="2"><sup>180</sup>Ta </td> <td rowspan="2" style="text-align:right">73 </td> <td rowspan="2" style="text-align:right">107 </td> <td rowspan="2">179.9474676(22) </td> <td rowspan="2">8.154(6) h </td> <td>EC (85%) </td> <td><b><sup>180</sup>Hf</b> </td> <td rowspan="2">1+ </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>β<sup>−</sup> (15%) </td> <td><i><b><sup>180</sup>W</b></i> </td></tr> <tr id="Tantalum-180m1"> <td style="text-indent:1em"><sup>180m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">75.3(14) keV </td> <td colspan="3" align="center"><b>Observationally stable</b><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>n 10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>n 11<span class="cite-bracket">]</span></a></sup> </td> <td>9− </td> <td>1.201(32)×10<sup>−4</sup> </td> <td> </td></tr> <tr id="Tantalum-180m2"> <td style="text-indent:1em"><sup>180m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1452.39(22) keV </td> <td>31.2(14) μs </td> <td>IT </td> <td> </td> <td>15− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-180m3"> <td style="text-indent:1em"><sup>180m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">3678.9(10) keV </td> <td>2.0(5) μs </td> <td>IT </td> <td> </td> <td>(22−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-180m4"> <td style="text-indent:1em"><sup>180m4</sup>Ta </td> <td colspan="3" style="text-indent:2em">4172.2(16) keV </td> <td>17(5) μs </td> <td>IT </td> <td> </td> <td>(24+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-181"> <td><sup>181</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">108 </td> <td>180.9479985(17) </td> <td colspan="3" align="center"><b>Observationally stable</b><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>n 12<span class="cite-bracket">]</span></a></sup> </td> <td>7/2+ </td> <td>0.9998799(32) </td> <td> </td></tr> <tr id="Tantalum-181m1"> <td style="text-indent:1em"><sup>181m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">6.237(20) keV </td> <td>6.05(12) μs </td> <td>IT </td> <td><b><sup>181</sup>Ta</b> </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-181m2"> <td style="text-indent:1em"><sup>181m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">615.19(3) keV </td> <td>18(1) μs </td> <td>IT </td> <td><b><sup>181</sup>Ta</b> </td> <td>1/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-181m3"> <td style="text-indent:1em"><sup>181m3</sup>Ta </td> <td colspan="3" style="text-indent:2em">1428(14) keV </td> <td>140(36) ns </td> <td>IT </td> <td><b><sup>181</sup>Ta</b> </td> <td>19/2+# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-181m4"> <td style="text-indent:1em"><sup>181m4</sup>Ta </td> <td colspan="3" style="text-indent:2em">1483.43(21) keV </td> <td>25.2(18) μs </td> <td>IT </td> <td><b><sup>181</sup>Ta</b> </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-181m5"> <td style="text-indent:1em"><sup>181m5</sup>Ta </td> <td colspan="3" style="text-indent:2em">2227.9(9) keV </td> <td>210(20) μs </td> <td>IT </td> <td><b><sup>181</sup>Ta</b> </td> <td>29/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-182"> <td><sup>182</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">109 </td> <td>181.9501546(17) </td> <td>114.74(12) d </td> <td>β<sup>−</sup> </td> <td><b><sup>182</sup>W</b> </td> <td>3− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-182m1"> <td style="text-indent:1em"><sup>182m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">16.273(4) keV </td> <td>283(3) ms </td> <td>IT </td> <td><sup>182</sup>Ta </td> <td>5+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-182m2"> <td style="text-indent:1em"><sup>182m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">519.577(16) keV </td> <td>15.84(10) min </td> <td>IT </td> <td><sup>182</sup>Ta </td> <td>10− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-183"> <td><sup>183</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">110 </td> <td>182.9513754(17) </td> <td>5.1(1) d </td> <td>β<sup>−</sup> </td> <td><b><sup>183</sup>W</b> </td> <td>7/2+ </td> <td> </td> <td> </td></tr> <tr id="Tantalum-183m1"> <td style="text-indent:1em"><sup>183m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">73.164(14) keV </td> <td>106(10) ns </td> <td>IT </td> <td><sup>183</sup>Ta </td> <td>9/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-183m2"> <td style="text-indent:1em"><sup>183m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1335(14) keV </td> <td>0.9(3) μs </td> <td>IT </td> <td><sup>183</sup>Ta </td> <td>(19/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-184"> <td><sup>184</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">111 </td> <td>183.954010(28) </td> <td>8.7(1) h </td> <td>β<sup>−</sup> </td> <td><b><sup>184</sup>W</b> </td> <td>(5−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-185"> <td><sup>185</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">112 </td> <td>184.955561(15) </td> <td>49.4(15) min </td> <td>β<sup>−</sup> </td> <td><sup>185</sup>W </td> <td>(7/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-185m1"> <td style="text-indent:1em"><sup>185m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">406(1) keV </td> <td>0.9(3) μs </td> <td>IT </td> <td><sup>185</sup>Ta </td> <td>(3/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-185m2"> <td style="text-indent:1em"><sup>185m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">1273.4(4) keV </td> <td>11.8(14) ms </td> <td>IT </td> <td><sup>185</sup>Ta </td> <td>21/2− </td> <td> </td> <td> </td></tr> <tr id="Tantalum-186"> <td><sup>186</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">113 </td> <td>185.958553(64) </td> <td>10.5(3) min </td> <td>β<sup>−</sup> </td> <td><b><sup>186</sup>W</b> </td> <td>3# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-186m"> <td style="text-indent:1em"><sup>186m</sup>Ta </td> <td colspan="3" style="text-indent:2em">336(20) keV </td> <td>1.54(5) min </td> <td> </td> <td> </td> <td>9+# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-187"> <td><sup>187</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">114 </td> <td>186.960391(60) </td> <td>2.3(60) min </td> <td>β<sup>−</sup> </td> <td><sup>187</sup>W </td> <td>(7/2+) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-187m1"> <td style="text-indent:1em"><sup>187m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">1778(1) keV </td> <td>7.3(9) s </td> <td>IT </td> <td><sup>187</sup>Ta </td> <td>(25/2−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-187m2"> <td rowspan="2" style="text-indent:1em"><sup>187m2</sup>Ta<sup id="cite_ref-187mTa-2025_19-0" class="reference"><a href="#cite_note-187mTa-2025-19"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </td> <td rowspan="2" colspan="3" style="text-indent:2em">2933(14) keV </td> <td rowspan="2">136(24) s </td> <td>β<sup>−</sup> </td> <td><sup>187m</sup>W </td> <td rowspan="2">41/2+#<br />[≥35/2] </td> <td rowspan="2"> </td> <td rowspan="2"> </td></tr> <tr> <td>IT </td> <td><sup>187m1</sup>Ta </td></tr> <tr id="Tantalum-188"> <td><sup>188</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">115 </td> <td>187.96360(22)# </td> <td>19.6(20) s </td> <td>β<sup>−</sup> </td> <td><sup>188</sup>W </td> <td>(1−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-188m1"> <td style="text-indent:1em"><sup>188m1</sup>Ta </td> <td colspan="3" style="text-indent:2em">99(33) keV </td> <td>19.6(20) s </td> <td> </td> <td> </td> <td>(7−) </td> <td> </td> <td> </td></tr> <tr id="Tantalum-188m2"> <td style="text-indent:1em"><sup>188m2</sup>Ta </td> <td colspan="3" style="text-indent:2em">391(33) keV </td> <td>3.6(4) μs </td> <td>IT </td> <td><sup>188</sup>Ta </td> <td>10+# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-189"> <td><sup>189</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">116 </td> <td>188.96569(22)# </td> <td>20# s<br />[>300 ns] </td> <td>β<sup>−</sup> </td> <td><sup>189</sup>W </td> <td>7/2+# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-189m"> <td style="text-indent:1em"><sup>189m</sup>Ta </td> <td colspan="3" style="text-indent:2em">1650(100)# keV </td> <td>1.6(2) μs </td> <td>IT </td> <td><sup>189</sup>Ta </td> <td>21/2−# </td> <td> </td> <td> </td></tr> <tr id="Tantalum-190"> <td><sup>190</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">117 </td> <td>189.96917(22)# </td> <td>5.3(7) s </td> <td>β<sup>−</sup> </td> <td><sup>190</sup>W </td> <td>(3) </td> <td> </td></tr> <tr id="Tantalum-191"> <td><sup>191</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">118 </td> <td>190.97153(32)# </td> <td>460# ms<br />[>300 ns] </td> <td> </td> <td> </td> <td>7/2+# </td> <td> </td></tr> <tr id="Tantalum-192"> <td><sup>192</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">119 </td> <td>191.97520(43)# </td> <td>2.2(7) s </td> <td>β<sup>−</sup> </td> <td><sup>192</sup>W </td> <td>(2) </td> <td> </td></tr> <tr id="Tantalum-193"> <td><sup>193</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">120 </td> <td>192.97766(43)# </td> <td>220# ms<br />[>300 ns] </td> <td> </td> <td> </td> <td>7/2+# </td> <td> </td></tr> <tr id="Tantalum-194"> <td><sup>194</sup>Ta </td> <td style="text-align:right">73 </td> <td style="text-align:right">121 </td> <td>193.98161(54)# </td> <td>2# s<br />[>300 ns] </td> <td> </td> <td> </td> <td> </td> <td> </td></tr> <tr> <th colspan="20" style="text-align:right; line-height:85%;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886047488"><span class="nobold"><i>This table header & footer:</i> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist"><ul><li class="nv-view"><a href="/wiki/Template:Isotopes_table" title="Template:Isotopes table"><span title="View this template">view</span></a></li></ul></div></span> </th></tr></tbody></table> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><sup>m</sup>Ta –  Excited <a href="/wiki/Nuclear_isomer" title="Nuclear isomer">nuclear isomer</a>.</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">( ) –  Uncertainty (1<i>σ</i>) is given in concise form in parentheses after the corresponding last digits.</span> </li> <li id="cite_note-TMS-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-TMS_8-0">^</a></b></span> <span class="reference-text"># –  Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).</span> </li> <li id="cite_note-TNN-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-TNN_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-TNN_9-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-TNN_9-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"># –  Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).</span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"> Modes of decay: <table style="margin-left:1.5em;"> <tbody><tr style="line-height: 1.1em; vertical-align: top"> <td>EC:</td> <td><a href="/wiki/Electron_capture" title="Electron capture">Electron capture</a> <p><br /> </p> </td></tr> <tr style="line-height: 1.1em; vertical-align: top"> <td>IT:</td> <td><a href="/wiki/Isomeric_transition" class="mw-redirect" title="Isomeric transition">Isomeric transition</a> <p><br /> </p> </td></tr> <tr style="line-height: 1.1em; vertical-align: top"> <td>p:</td> <td><a href="/wiki/Proton_emission" title="Proton emission">Proton emission</a> </td></tr></tbody></table></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><i><b>Bold italics symbol</b></i> as daughter –  Daughter product is nearly stable.</span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><b>Bold symbol</b> as daughter –  Daughter product is stable.</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text">( ) spin value –  Indicates spin with weak assignment arguments.</span> </li> <li id="cite_note-order-14"><span class="mw-cite-backlink">^ <a href="#cite_ref-order_14-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-order_14-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-order_14-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-order_14-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-order_14-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text">Order of ground state and isomer is uncertain.</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text">Only known observationally stable nuclear isomer, believed to decay by isomeric transition to <sup>180</sup>Ta, β<sup>−</sup> decay to <i><b><sup>180</sup>W</b></i>, or electron capture to <b><sup>180</sup>Hf</b> with a half-life over 2.9×10<sup>17</sup> years;<sup id="cite_ref-180mTa_2023_15-0" class="reference"><a href="#cite_note-180mTa_2023-15"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> also theorized to undergo α decay to <i><b><sup>176</sup>Lu</b></i></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text">One of the few (observationally) stable <a href="/wiki/Even_and_odd_atomic_nuclei#Odd_proton,_odd_neutron" title="Even and odd atomic nuclei">odd-odd nuclei</a></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text">Believed to undergo α decay to <sup>177</sup>Lu</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Tantalum-180m">Tantalum-180m</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Isotopes_of_tantalum&action=edit&section=2" title="Edit section: Tantalum-180m"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The nuclide <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180m</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> (<i>m</i> denotes a <a href="/wiki/Metastable" class="mw-redirect" title="Metastable">metastable</a> state) is one of a very few <a href="/wiki/Nuclear_isomer" title="Nuclear isomer">nuclear isomers</a> which are more stable than their ground states. Although it is not unique in this regard (this property is shared by <a href="/wiki/Bismuth-210m" class="mw-redirect" title="Bismuth-210m">bismuth-210m</a> (<sup>210m</sup>Bi) and <a href="/wiki/Americium-242m" class="mw-redirect" title="Americium-242m">americium-242m</a> (<sup>242m</sup>Am), among other nuclides), it is exceptional in that it is <a href="/wiki/Stable_nuclide#Still-unobserved_decay" title="Stable nuclide">observationally stable</a>: no decay has <i>ever</i> been observed. In contrast, the ground state nuclide <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> has a half-life of only 8 hours. </p><p><span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180m</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> has sufficient energy to decay in three ways: <a href="/wiki/Isomeric_transition" class="mw-redirect" title="Isomeric transition">isomeric transition</a> to the <a href="/wiki/Ground_state" title="Ground state">ground state</a> of <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span>, <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a> to <a href="/wiki/Tungsten" title="Tungsten"><span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>W<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span></a>, or <a href="/wiki/Electron_capture" title="Electron capture">electron capture</a> to <a href="/wiki/Hafnium" title="Hafnium"><span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Hf<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span></a>. However, no radioactivity from any of these theoretically possible decay modes has ever been observed. As of 2023, the half-life of <sup>180m</sup>Ta is calculated from experimental observation to be at least <span class="nowrap"><span data-sort-value="7017290000000000000♠"></span>2.9<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>17</sup></span> (290 quadrillion) years.<sup id="cite_ref-180mTa_2023_15-1" class="reference"><a href="#cite_note-180mTa_2023-15"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The very slow decay of <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180m</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> is attributed to its high spin (9 units) and the low spin of lower-lying states. Gamma or beta decay would require many units of angular momentum to be removed in a single step, so that the process would be very slow.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>Because of this stability, <span style="white-space:nowrap;"><span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:right"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">180m</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span>Ta<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:0.8em;line-height:1.0em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sub></span></span></span> is a <a href="/wiki/Primordial_nuclide" title="Primordial nuclide">primordial nuclide</a>, the only naturally occurring <a href="/wiki/Nuclear_isomer" title="Nuclear isomer">nuclear isomer</a> (excluding short-lived radiogenic and cosmogenic nuclides). It is also the rarest primordial nuclide in the Universe observed for any element which has any stable isotopes. In an <a href="/wiki/S-process" title="S-process">s-process</a> stellar environment with a thermal energy <a href="/wiki/Boltzmann_constant" title="Boltzmann constant">k<sub>B</sub></a>T = <span class="nowrap"><span data-sort-value="6985416565886619999♠"></span>26 <a href="/wiki/Electronvolt" title="Electronvolt">keV</a></span> (i.e. a temperature of 300 million kelvin), the nuclear isomers are expected to be fully thermalized, meaning that <sup>180</sup>Ta rapidly transitions between spin states and its overall half-life is predicted to be 11 hours.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>It is one of only <a href="/wiki/Stable_nuclide#Odd_and_even_proton_and_neutron_count" title="Stable nuclide">five stable nuclides</a> to have both an odd number of protons and an odd number of neutrons, the other four stable <a href="/wiki/Even_and_odd_atomic_nuclei#Odd_proton,_odd_neutron" title="Even and odd atomic nuclei">odd-odd nuclides</a> being <a href="/wiki/Deuterium" title="Deuterium"><sup>2</sup>H</a>, <a href="/wiki/Isotopes_of_lithium#Lithium-6" title="Isotopes of lithium"><sup>6</sup>Li</a>, <a href="/wiki/Isotopes_of_boron" title="Isotopes of boron"><sup>10</sup>B</a> and <a href="/wiki/Isotopes_of_nitrogen#Nitrogen-14" title="Isotopes of nitrogen"><sup>14</sup>N</a>.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Isotopes_of_tantalum&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style 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Mohr; F. Kaeppeler; R. Gallino (2007). "Survival of Nature's Rarest Isotope <sup>180</sup>Ta under Stellar Conditions". <i>Phys. Rev. C</i>. <b>75</b> 012802. <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/astro-ph/0612427">astro-ph/0612427</a></span>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1103%2FPhysRevC.75.012802">10.1103/PhysRevC.75.012802</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:44724195">44724195</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Phys.+Rev.+C&rft.atitle=Survival+of+Nature%27s+Rarest+Isotope+%3Csup%3E180%3C%2Fsup%3ETa+under+Stellar+Conditions&rft.volume=75&rft.artnum=012802&rft.date=2007&rft_id=info%3Aarxiv%2Fastro-ph%2F0612427&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A44724195%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1103%2FPhysRevC.75.012802&rft.au=P.+Mohr&rft.au=F.+Kaeppeler&rft.au=R.+Gallino&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLide2002" class="citation book cs1">Lide, David R., ed. (2002). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170724011402/http://www.hbcpnetbase.com/"><i>Handbook of Chemistry & Physics</i></a> (88th ed.). CRC. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-8493-0486-6" title="Special:BookSources/978-0-8493-0486-6"><bdi>978-0-8493-0486-6</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/179976746">179976746</a>. Archived from <a rel="nofollow" class="external text" href="http://www.hbcpnetbase.com/">the original</a> on 24 July 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-05-23</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Handbook+of+Chemistry+%26+Physics&rft.edition=88th&rft.pub=CRC&rft.date=2002&rft_id=info%3Aoclcnum%2F179976746&rft.isbn=978-0-8493-0486-6&rft_id=http%3A%2F%2Fwww.hbcpnetbase.com%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></span> </li> </ol></div></div> <ul><li>Isotope masses from: <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAudiBersillonBlachotWapstra2003" class="citation cs2">Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/wiki/Aaldert_Wapstra" title="Aaldert Wapstra">Wapstra, Aaldert Hendrik</a> (2003), <a rel="nofollow" class="external text" href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The N<small>UBASE</small> evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, <b>729</b>: <span class="nowrap">3–</span>128, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nuclear+Physics+A&rft.atitle=The+N%3Csmall%3EUBASE%3C%2Fsmall%3E+evaluation+of+nuclear+and+decay+properties&rft.volume=729&rft.pages=%3Cspan+class%3D%22nowrap%22%3E3-%3C%2Fspan%3E128&rft.date=2003&rft_id=info%3Adoi%2F10.1016%2Fj.nuclphysa.2003.11.001&rft_id=info%3Abibcode%2F2003NuPhA.729....3A&rft.aulast=Audi&rft.aufirst=Georges&rft.au=Bersillon%2C+Olivier&rft.au=Blachot%2C+Jean&rft.au=Wapstra%2C+Aaldert+Hendrik&rft_id=https%3A%2F%2Fhal.archives-ouvertes.fr%2Fin2p3-00020241%2Fdocument&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li></ul></li> <li>Isotopic compositions and standard atomic masses from: <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFde_LaeterBöhlkeDe_BièvreHidaka2003" class="citation journal cs1"><a href="/wiki/John_Robert_de_Laeter" title="John Robert de Laeter">de Laeter, John Robert</a>; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). <a rel="nofollow" class="external text" href="https://doi.org/10.1351%2Fpac200375060683">"Atomic weights of the elements. Review 2000 (IUPAC Technical Report)"</a>. <i><a href="/wiki/Pure_and_Applied_Chemistry" title="Pure and Applied Chemistry">Pure and Applied Chemistry</a></i>. <b>75</b> (6): <span class="nowrap">683–</span>800. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1351%2Fpac200375060683">10.1351/pac200375060683</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Pure+and+Applied+Chemistry&rft.atitle=Atomic+weights+of+the+elements.+Review+2000+%28IUPAC+Technical+Report%29&rft.volume=75&rft.issue=6&rft.pages=%3Cspan+class%3D%22nowrap%22%3E683-%3C%2Fspan%3E800&rft.date=2003&rft_id=info%3Adoi%2F10.1351%2Fpac200375060683&rft.aulast=de+Laeter&rft.aufirst=John+Robert&rft.au=B%C3%B6hlke%2C+John+Karl&rft.au=De+Bi%C3%A8vre%2C+Paul&rft.au=Hidaka%2C+Hiroshi&rft.au=Peiser%2C+H.+Steffen&rft.au=Rosman%2C+Kevin+J.+R.&rft.au=Taylor%2C+Philip+D.+P.&rft_id=https%3A%2F%2Fdoi.org%2F10.1351%252Fpac200375060683&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWieser2006" class="citation journal cs1">Wieser, Michael E. (2006). <a rel="nofollow" class="external text" href="https://doi.org/10.1351%2Fpac200678112051">"Atomic weights of the elements 2005 (IUPAC Technical Report)"</a>. <i><a href="/wiki/Pure_and_Applied_Chemistry" title="Pure and Applied Chemistry">Pure and Applied Chemistry</a></i>. <b>78</b> (11): <span class="nowrap">2051–</span>2066. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1351%2Fpac200678112051">10.1351/pac200678112051</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Pure+and+Applied+Chemistry&rft.atitle=Atomic+weights+of+the+elements+2005+%28IUPAC+Technical+Report%29&rft.volume=78&rft.issue=11&rft.pages=%3Cspan+class%3D%22nowrap%22%3E2051-%3C%2Fspan%3E2066&rft.date=2006&rft_id=info%3Adoi%2F10.1351%2Fpac200678112051&rft.aulast=Wieser&rft.aufirst=Michael+E.&rft_id=https%3A%2F%2Fdoi.org%2F10.1351%252Fpac200678112051&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li></ul></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html">"News & Notices: Standard Atomic Weights Revised"</a>. <i>International Union of Pure and Applied Chemistry</i>. 19 October 2005.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=International+Union+of+Pure+and+Applied+Chemistry&rft.atitle=News+%26+Notices%3A+Standard+Atomic+Weights+Revised&rft.date=2005-10-19&rft_id=http%3A%2F%2Fold.iupac.org%2Fnews%2Farchives%2F2005%2Fatomic-weights_revised05.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li> <li>Half-life, spin, and isomer data selected from the following sources. <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAudiBersillonBlachotWapstra2003" class="citation cs2">Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/wiki/Aaldert_Wapstra" title="Aaldert Wapstra">Wapstra, Aaldert Hendrik</a> (2003), <a rel="nofollow" class="external text" href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The N<small>UBASE</small> evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, <b>729</b>: <span class="nowrap">3–</span>128, <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nuclear+Physics+A&rft.atitle=The+N%3Csmall%3EUBASE%3C%2Fsmall%3E+evaluation+of+nuclear+and+decay+properties&rft.volume=729&rft.pages=%3Cspan+class%3D%22nowrap%22%3E3-%3C%2Fspan%3E128&rft.date=2003&rft_id=info%3Adoi%2F10.1016%2Fj.nuclphysa.2003.11.001&rft_id=info%3Abibcode%2F2003NuPhA.729....3A&rft.aulast=Audi&rft.aufirst=Georges&rft.au=Bersillon%2C+Olivier&rft.au=Blachot%2C+Jean&rft.au=Wapstra%2C+Aaldert+Hendrik&rft_id=https%3A%2F%2Fhal.archives-ouvertes.fr%2Fin2p3-00020241%2Fdocument&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNational_Nuclear_Data_Center" class="citation web cs1"><a href="/wiki/National_Nuclear_Data_Center" title="National Nuclear Data Center">National Nuclear Data Center</a>. <a rel="nofollow" class="external text" href="http://www.nndc.bnl.gov/nudat2/">"NuDat 2.x database"</a>. <a href="/wiki/Brookhaven_National_Laboratory" title="Brookhaven National Laboratory">Brookhaven National Laboratory</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=NuDat+2.x+database&rft.pub=Brookhaven+National+Laboratory&rft.au=National+Nuclear+Data+Center&rft_id=http%3A%2F%2Fwww.nndc.bnl.gov%2Fnudat2%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHolden2004" class="citation book cs1">Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). <i><a href="/wiki/CRC_Handbook_of_Chemistry_and_Physics" title="CRC Handbook of Chemistry and Physics">CRC Handbook of Chemistry and Physics</a></i> (85th ed.). <a href="/wiki/Boca_Raton,_Florida" title="Boca Raton, Florida">Boca Raton, Florida</a>: <a href="/wiki/CRC_Press" title="CRC Press">CRC Press</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-8493-0485-9" title="Special:BookSources/978-0-8493-0485-9"><bdi>978-0-8493-0485-9</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=11.+Table+of+the+Isotopes&rft.btitle=CRC+Handbook+of+Chemistry+and+Physics&rft.place=Boca+Raton%2C+Florida&rft.edition=85th&rft.pub=CRC+Press&rft.date=2004&rft.isbn=978-0-8493-0485-9&rft.aulast=Holden&rft.aufirst=Norman+E.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIsotopes+of+tantalum" class="Z3988"></span></li></ul></li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Isotopes_of_the_chemical_elements285" style="padding:3px"><table class="nowraplinks mw-collapsible expanded navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Navbox_element_isotopes" title="Template:Navbox element isotopes"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Navbox_element_isotopes" title="Template talk:Navbox element isotopes"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Navbox_element_isotopes" title="Special:EditPage/Template:Navbox element isotopes"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Isotopes_of_the_chemical_elements285" style="font-size:114%;margin:0 4em"><a href="/wiki/Isotope" title="Isotope">Isotopes</a> of the <a href="/wiki/Chemical_element" title="Chemical element">chemical elements</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0;line-height:110%;"><div style="padding:0 0.25em"> <table style="border-spacing:1px;display:block;overflow:auto;width:100%;margin:0 !important"> <tbody><tr style="line-height:125%; vertical-align:top;"> <th style="text-align:right; width:3%;"><a href="/wiki/Group_(periodic_table)" title="Group (periodic table)">Group</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Alkali_metal" title="Alkali metal">1</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Alkaline_earth_metal" title="Alkaline earth metal">2</a> </th> <td style="width:2%">  </td> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Group_3_element" title="Group 3 element">3</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Group_4_element" title="Group 4 element">4</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Group_5_element" title="Group 5 element">5</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Group_6_element" title="Group 6 element">6</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Group_7_element" title="Group 7 element">7</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Group_8_element" title="Group 8 element">8</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Group_9_element" title="Group 9 element">9</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Group_10_element" title="Group 10 element">10</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Group_11_element" title="Group 11 element">11</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Group_12_element" title="Group 12 element">12</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Boron_group" title="Boron group">13</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Carbon_group" title="Carbon group">14</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Pnictogen" title="Pnictogen">15</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Chalcogen" title="Chalcogen">16</a> </th> <th style="background:#e8e8e8;color:inherit; width:5%"><a href="/wiki/Halogen" title="Halogen">17</a> </th> <th style="background:#f0f0f0;color:inherit; width:5%"><a href="/wiki/Noble_gas" title="Noble gas">18</a> </th></tr> <tr style="font-size:85%; line-height:125%; vertical-align:top;"> <th style="text-align:left; vertical-align:bottom;"><a href="/wiki/Period_(periodic_table)" title="Period (periodic table)">Period</a> </th> <td style="background:#e8e8e8;color:black;">Hydrogen and<br />alkali metals </td> <td style="background:#f0f0f0;color:black;">Alkaline<br />earth metals </td> <td> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;"> </td> <td style="background:#f0f0f0;color:black;"> </td> <td style="background:#e8e8e8;color:black;">Pnictogens </td> <td style="background:#f0f0f0;color:black;">Chalcogens </td> <td style="background:#e8e8e8;color:black;">Halogens </td> <td style="background:#f0f0f0;color:black;">Noble gases </td></tr> <tr> <th style=""><span title="Period ①" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_1_element" title="Period 1 element">①</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_hydrogen" title="Isotopes of hydrogen">Isotopes</a>  <a href="/wiki/Isotopes_of_hydrogen#List_of_isotopes" title="Isotopes of hydrogen">§ List</a></div><div style="display:block"><b><a href="/wiki/Hydrogen" title="Hydrogen">H</a></b></div>1 </td> <td colspan="17"> </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_helium" title="Isotopes of helium">Isotopes</a>  <a href="/wiki/Isotopes_of_helium#List_of_isotopes" title="Isotopes of helium">§ List</a></div><div style="display:block"><b><a href="/wiki/Helium" title="Helium">He</a></b></div>2 </td></tr> <tr> <th style=""><span title="Period ②" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_2_element" title="Period 2 element">②</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_lithium" title="Isotopes of lithium">Isotopes</a>  <a href="/wiki/Isotopes_of_lithium#List_of_isotopes" title="Isotopes of lithium">§ List</a></div><div style="display:block"><b><a href="/wiki/Lithium" title="Lithium">Li</a></b></div>3 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_beryllium" title="Isotopes of beryllium">Isotopes</a>  <a href="/wiki/Isotopes_of_beryllium#List_of_isotopes" title="Isotopes of beryllium">§ List</a></div><div style="display:block"><b><a href="/wiki/Beryllium" title="Beryllium">Be</a></b></div>4 </td> <td colspan="11"> </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_boron" title="Isotopes of boron">Isotopes</a>  <a href="/wiki/Isotopes_of_boron#List_of_isotopes" title="Isotopes of boron">§ List</a></div><div style="display:block"><b><a href="/wiki/Boron" title="Boron">B</a></b></div>5 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_carbon" title="Isotopes of carbon">Isotopes</a>  <a href="/wiki/Isotopes_of_carbon#List_of_isotopes" title="Isotopes of carbon">§ List</a></div><div style="display:block"><b><a href="/wiki/Carbon" title="Carbon">C</a></b></div>6 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_nitrogen" title="Isotopes of nitrogen">Isotopes</a>  <a href="/wiki/Isotopes_of_nitrogen#List_of_isotopes" title="Isotopes of nitrogen">§ List</a></div><div style="display:block"><b><a href="/wiki/Nitrogen" title="Nitrogen">N</a></b></div>7 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_oxygen" title="Isotopes of oxygen">Isotopes</a>  <a href="/wiki/Isotopes_of_oxygen#List_of_isotopes" title="Isotopes of oxygen">§ List</a></div><div style="display:block"><b><a href="/wiki/Oxygen" title="Oxygen">O</a></b></div>8 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_fluorine" title="Isotopes of fluorine">Isotopes</a>  <a href="/wiki/Isotopes_of_fluorine#List_of_isotopes" title="Isotopes of fluorine">§ List</a></div><div style="display:block"><b><a href="/wiki/Fluorine" title="Fluorine">F</a></b></div>9 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_neon" title="Isotopes of neon">Isotopes</a>  <a href="/wiki/Isotopes_of_neon#List_of_isotopes" title="Isotopes of neon">§ List</a></div><div style="display:block"><b><a href="/wiki/Neon" title="Neon">Ne</a></b></div>10 </td></tr> <tr> <th style=""><span title="Period ③" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_3_element" title="Period 3 element">③</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_sodium" title="Isotopes of sodium">Isotopes</a>  <a href="/wiki/Isotopes_of_sodium#List_of_isotopes" title="Isotopes of sodium">§ List</a></div><div style="display:block"><b><a href="/wiki/Sodium" title="Sodium">Na</a></b></div>11 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_magnesium" title="Isotopes of magnesium">Isotopes</a>  <a href="/wiki/Isotopes_of_magnesium#List_of_isotopes" title="Isotopes of magnesium">§ List</a></div><div style="display:block"><b><a href="/wiki/Magnesium" title="Magnesium">Mg</a></b></div>12 </td> <td colspan="11"> </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_aluminium" title="Isotopes of aluminium">Isotopes</a>  <a href="/wiki/Isotopes_of_aluminium#List_of_isotopes" title="Isotopes of aluminium">§ List</a></div><div style="display:block"><b><a href="/wiki/Aluminium" title="Aluminium">Al</a></b></div>13 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_silicon" title="Isotopes of silicon">Isotopes</a>  <a href="/wiki/Isotopes_of_silicon#List_of_isotopes" title="Isotopes of silicon">§ List</a></div><div style="display:block"><b><a href="/wiki/Silicon" title="Silicon">Si</a></b></div>14 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_phosphorus" title="Isotopes of phosphorus">Isotopes</a>  <a href="/wiki/Isotopes_of_phosphorus#List_of_isotopes" title="Isotopes of phosphorus">§ List</a></div><div style="display:block"><b><a href="/wiki/Phosphorus" title="Phosphorus">P</a></b></div>15 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_sulfur" title="Isotopes of sulfur">Isotopes</a>  <a href="/wiki/Isotopes_of_sulfur#List_of_isotopes" title="Isotopes of sulfur">§ List</a></div><div style="display:block"><b><a href="/wiki/Sulfur" title="Sulfur">S</a></b></div>16 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_chlorine" title="Isotopes of chlorine">Isotopes</a>  <a href="/wiki/Isotopes_of_chlorine#List_of_isotopes" title="Isotopes of chlorine">§ List</a></div><div style="display:block"><b><a href="/wiki/Chlorine" title="Chlorine">Cl</a></b></div>17 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_argon" title="Isotopes of argon">Isotopes</a>  <a href="/wiki/Isotopes_of_argon#List_of_isotopes" title="Isotopes of argon">§ List</a></div><div style="display:block"><b><a href="/wiki/Argon" title="Argon">Ar</a></b></div>18 </td></tr> <tr> <th style=""><span title="Period ④" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_4_element" title="Period 4 element">④</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_potassium" title="Isotopes of potassium">Isotopes</a>  <a href="/wiki/Isotopes_of_potassium#List_of_isotopes" title="Isotopes of potassium">§ List</a></div><div style="display:block"><b><a href="/wiki/Potassium" title="Potassium">K</a></b></div>19 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_calcium" title="Isotopes of calcium">Isotopes</a>  <a href="/wiki/Isotopes_of_calcium#List_of_isotopes" title="Isotopes of calcium">§ List</a></div><div style="display:block"><b><a href="/wiki/Calcium" title="Calcium">Ca</a></b></div>20 </td> <td> </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_scandium" title="Isotopes of scandium">Isotopes</a>  <a href="/wiki/Isotopes_of_scandium#List_of_isotopes" title="Isotopes of scandium">§ List</a></div><div style="display:block"><b><a href="/wiki/Scandium" title="Scandium">Sc</a></b></div>21 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_titanium" title="Isotopes of titanium">Isotopes</a>  <a href="/wiki/Isotopes_of_titanium#List_of_isotopes" title="Isotopes of titanium">§ List</a></div><div style="display:block"><b><a href="/wiki/Titanium" title="Titanium">Ti</a></b></div>22 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_vanadium" title="Isotopes of vanadium">Isotopes</a>  <a href="/wiki/Isotopes_of_vanadium#List_of_isotopes" title="Isotopes of vanadium">§ List</a></div><div style="display:block"><b><a href="/wiki/Vanadium" title="Vanadium">V</a></b></div>23 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_chromium" title="Isotopes of chromium">Isotopes</a>  <a href="/wiki/Isotopes_of_chromium#List_of_isotopes" title="Isotopes of chromium">§ List</a></div><div style="display:block"><b><a href="/wiki/Chromium" title="Chromium">Cr</a></b></div>24 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_manganese" title="Isotopes of manganese">Isotopes</a>  <a href="/wiki/Isotopes_of_manganese#List_of_isotopes" title="Isotopes of manganese">§ List</a></div><div style="display:block"><b><a href="/wiki/Manganese" title="Manganese">Mn</a></b></div>25 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_iron" title="Isotopes of iron">Isotopes</a>  <a href="/wiki/Isotopes_of_iron#List_of_isotopes" title="Isotopes of iron">§ List</a></div><div style="display:block"><b><a href="/wiki/Iron" title="Iron">Fe</a></b></div>26 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_cobalt" title="Isotopes of cobalt">Isotopes</a>  <a href="/wiki/Isotopes_of_cobalt#List_of_isotopes" title="Isotopes of cobalt">§ List</a></div><div style="display:block"><b><a href="/wiki/Cobalt" title="Cobalt">Co</a></b></div>27 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_nickel" title="Isotopes of nickel">Isotopes</a>  <a href="/wiki/Isotopes_of_nickel#List_of_isotopes" title="Isotopes of nickel">§ List</a></div><div style="display:block"><b><a href="/wiki/Nickel" title="Nickel">Ni</a></b></div>28 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_copper" title="Isotopes of copper">Isotopes</a>  <a href="/wiki/Isotopes_of_copper#List_of_isotopes" title="Isotopes of copper">§ List</a></div><div style="display:block"><b><a href="/wiki/Copper" title="Copper">Cu</a></b></div>29 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_zinc" title="Isotopes of zinc">Isotopes</a>  <a href="/wiki/Isotopes_of_zinc#List_of_isotopes" title="Isotopes of zinc">§ List</a></div><div style="display:block"><b><a href="/wiki/Zinc" title="Zinc">Zn</a></b></div>30 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_gallium" title="Isotopes of gallium">Isotopes</a>  <a href="/wiki/Isotopes_of_gallium#List_of_isotopes" title="Isotopes of gallium">§ List</a></div><div style="display:block"><b><a href="/wiki/Gallium" title="Gallium">Ga</a></b></div>31 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_germanium" title="Isotopes of germanium">Isotopes</a>  <a href="/wiki/Isotopes_of_germanium#List_of_isotopes" title="Isotopes of germanium">§ List</a></div><div style="display:block"><b><a href="/wiki/Germanium" title="Germanium">Ge</a></b></div>32 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_arsenic" title="Isotopes of arsenic">Isotopes</a>  <a href="/wiki/Isotopes_of_arsenic#List_of_isotopes" title="Isotopes of arsenic">§ List</a></div><div style="display:block"><b><a href="/wiki/Arsenic" title="Arsenic">As</a></b></div>33 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_selenium" title="Isotopes of selenium">Isotopes</a>  <a href="/wiki/Isotopes_of_selenium#List_of_isotopes" title="Isotopes of selenium">§ List</a></div><div style="display:block"><b><a href="/wiki/Selenium" title="Selenium">Se</a></b></div>34 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_bromine" title="Isotopes of bromine">Isotopes</a>  <a href="/wiki/Isotopes_of_bromine#List_of_isotopes" title="Isotopes of bromine">§ List</a></div><div style="display:block"><b><a href="/wiki/Bromine" title="Bromine">Br</a></b></div>35 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_krypton" title="Isotopes of krypton">Isotopes</a>  <a href="/wiki/Isotopes_of_krypton#List_of_isotopes" title="Isotopes of krypton">§ List</a></div><div style="display:block"><b><a href="/wiki/Krypton" title="Krypton">Kr</a></b></div>36 </td></tr> <tr> <th style=""><span title="Period ⑤" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_5_element" title="Period 5 element">⑤</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_rubidium" title="Isotopes of rubidium">Isotopes</a>  <a href="/wiki/Isotopes_of_rubidium#List_of_isotopes" title="Isotopes of rubidium">§ List</a></div><div style="display:block"><b><a href="/wiki/Rubidium" title="Rubidium">Rb</a></b></div>37 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_strontium" title="Isotopes of strontium">Isotopes</a>  <a href="/wiki/Isotopes_of_strontium#List_of_isotopes" title="Isotopes of strontium">§ List</a></div><div style="display:block"><b><a href="/wiki/Strontium" title="Strontium">Sr</a></b></div>38 </td> <td> </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_yttrium" title="Isotopes of yttrium">Isotopes</a>  <a href="/wiki/Isotopes_of_yttrium#List_of_isotopes" title="Isotopes of yttrium">§ List</a></div><div style="display:block"><b><a href="/wiki/Yttrium" title="Yttrium">Y</a></b></div>39 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_zirconium" title="Isotopes of zirconium">Isotopes</a>  <a href="/wiki/Isotopes_of_zirconium#List_of_isotopes" title="Isotopes of zirconium">§ List</a></div><div style="display:block"><b><a href="/wiki/Zirconium" title="Zirconium">Zr</a></b></div>40 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_niobium" title="Isotopes of niobium">Isotopes</a>  <a href="/wiki/Isotopes_of_niobium#List_of_isotopes" title="Isotopes of niobium">§ List</a></div><div style="display:block"><b><a href="/wiki/Niobium" title="Niobium">Nb</a></b></div>41 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_molybdenum" title="Isotopes of molybdenum">Isotopes</a>  <a href="/wiki/Isotopes_of_molybdenum#List_of_isotopes" title="Isotopes of molybdenum">§ List</a></div><div style="display:block"><b><a href="/wiki/Molybdenum" title="Molybdenum">Mo</a></b></div>42 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_technetium" title="Isotopes of technetium">Isotopes</a>  <a href="/wiki/Isotopes_of_technetium#List_of_isotopes" title="Isotopes of technetium">§ List</a></div><div style="display:block"><b><a href="/wiki/Technetium" title="Technetium">Tc</a></b></div>43 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_ruthenium" title="Isotopes of ruthenium">Isotopes</a>  <a href="/wiki/Isotopes_of_ruthenium#List_of_isotopes" title="Isotopes of ruthenium">§ List</a></div><div style="display:block"><b><a href="/wiki/Ruthenium" title="Ruthenium">Ru</a></b></div>44 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_rhodium" title="Isotopes of rhodium">Isotopes</a>  <a href="/wiki/Isotopes_of_rhodium#List_of_isotopes" title="Isotopes of rhodium">§ List</a></div><div style="display:block"><b><a href="/wiki/Rhodium" title="Rhodium">Rh</a></b></div>45 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_palladium" title="Isotopes of palladium">Isotopes</a>  <a href="/wiki/Isotopes_of_palladium#List_of_isotopes" title="Isotopes of palladium">§ List</a></div><div style="display:block"><b><a href="/wiki/Palladium" title="Palladium">Pd</a></b></div>46 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_silver" title="Isotopes of silver">Isotopes</a>  <a href="/wiki/Isotopes_of_silver#List_of_isotopes" title="Isotopes of silver">§ List</a></div><div style="display:block"><b><a href="/wiki/Silver" title="Silver">Ag</a></b></div>47 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_cadmium" title="Isotopes of cadmium">Isotopes</a>  <a href="/wiki/Isotopes_of_cadmium#List_of_isotopes" title="Isotopes of cadmium">§ List</a></div><div style="display:block"><b><a href="/wiki/Cadmium" title="Cadmium">Cd</a></b></div>48 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_indium" title="Isotopes of indium">Isotopes</a>  <a href="/wiki/Isotopes_of_indium#List_of_isotopes" title="Isotopes of indium">§ List</a></div><div style="display:block"><b><a href="/wiki/Indium" title="Indium">In</a></b></div>49 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_tin" title="Isotopes of tin">Isotopes</a>  <a href="/wiki/Isotopes_of_tin#List_of_isotopes" title="Isotopes of tin">§ List</a></div><div style="display:block"><b><a href="/wiki/Tin" title="Tin">Sn</a></b></div>50 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_antimony" title="Isotopes of antimony">Isotopes</a>  <a href="/wiki/Isotopes_of_antimony#List_of_isotopes" title="Isotopes of antimony">§ List</a></div><div style="display:block"><b><a href="/wiki/Antimony" title="Antimony">Sb</a></b></div>51 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_tellurium" title="Isotopes of tellurium">Isotopes</a>  <a href="/wiki/Isotopes_of_tellurium#List_of_isotopes" title="Isotopes of tellurium">§ List</a></div><div style="display:block"><b><a href="/wiki/Tellurium" title="Tellurium">Te</a></b></div>52 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_iodine" title="Isotopes of iodine">Isotopes</a>  <a href="/wiki/Isotopes_of_iodine#List_of_isotopes" title="Isotopes of iodine">§ List</a></div><div style="display:block"><b><a href="/wiki/Iodine" title="Iodine">I</a></b></div>53 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_xenon" title="Isotopes of xenon">Isotopes</a>  <a href="/wiki/Isotopes_of_xenon#List_of_isotopes" title="Isotopes of xenon">§ List</a></div><div style="display:block"><b><a href="/wiki/Xenon" title="Xenon">Xe</a></b></div>54 </td></tr> <tr> <th style=""><span title="Period ⑥" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_6_element" title="Period 6 element">⑥</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_caesium" title="Isotopes of caesium">Isotopes</a>  <a href="/wiki/Isotopes_of_caesium#List_of_isotopes" title="Isotopes of caesium">§ List</a></div><div style="display:block"><b><a href="/wiki/Caesium" title="Caesium">Cs</a></b></div>55 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_barium" title="Isotopes of barium">Isotopes</a>  <a href="/wiki/Isotopes_of_barium#List_of_isotopes" title="Isotopes of barium">§ List</a></div><div style="display:block"><b><a href="/wiki/Barium" title="Barium">Ba</a></b></div>56 </td> <td style="text-align:center; vertical-align:middle; background:#9bff99;color:inherit;"><span class="skin-invert-image" typeof="mw:File"><span><img alt="1 asterisk" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/16px-Asterisks_one.svg.png" decoding="async" width="16" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/24px-Asterisks_one.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/32px-Asterisks_one.svg.png 2x" data-file-width="106" data-file-height="98" /></span></span> </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_lutetium" title="Isotopes of lutetium">Isotopes</a>  <a href="/wiki/Isotopes_of_lutetium#List_of_isotopes" title="Isotopes of lutetium">§ List</a></div><div style="display:block"><b><a href="/wiki/Lutetium" title="Lutetium">Lu</a></b></div>71 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_hafnium" title="Isotopes of hafnium">Isotopes</a>  <a href="/wiki/Isotopes_of_hafnium#List_of_isotopes" title="Isotopes of hafnium">§ List</a></div><div style="display:block"><b><a href="/wiki/Hafnium" title="Hafnium">Hf</a></b></div>72 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a class="mw-selflink selflink">Isotopes</a>  <a class="mw-selflink-fragment" href="#List_of_isotopes">§ List</a></div><div style="display:block"><b><a href="/wiki/Tantalum" title="Tantalum">Ta</a></b></div>73 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_tungsten" title="Isotopes of tungsten">Isotopes</a>  <a href="/wiki/Isotopes_of_tungsten#List_of_isotopes" title="Isotopes of tungsten">§ List</a></div><div style="display:block"><b><a href="/wiki/Tungsten" title="Tungsten">W</a></b></div>74 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_rhenium" title="Isotopes of rhenium">Isotopes</a>  <a href="/wiki/Isotopes_of_rhenium#List_of_isotopes" title="Isotopes of rhenium">§ List</a></div><div style="display:block"><b><a href="/wiki/Rhenium" title="Rhenium">Re</a></b></div>75 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_osmium" title="Isotopes of osmium">Isotopes</a>  <a href="/wiki/Isotopes_of_osmium#List_of_isotopes" title="Isotopes of osmium">§ List</a></div><div style="display:block"><b><a href="/wiki/Osmium" title="Osmium">Os</a></b></div>76 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_iridium" title="Isotopes of iridium">Isotopes</a>  <a href="/wiki/Isotopes_of_iridium#List_of_isotopes" title="Isotopes of iridium">§ List</a></div><div style="display:block"><b><a href="/wiki/Iridium" title="Iridium">Ir</a></b></div>77 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_platinum" title="Isotopes of platinum">Isotopes</a>  <a href="/wiki/Isotopes_of_platinum#List_of_isotopes" title="Isotopes of platinum">§ List</a></div><div style="display:block"><b><a href="/wiki/Platinum" title="Platinum">Pt</a></b></div>78 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_gold" title="Isotopes of gold">Isotopes</a>  <a href="/wiki/Isotopes_of_gold#List_of_isotopes" title="Isotopes of gold">§ List</a></div><div style="display:block"><b><a href="/wiki/Gold" title="Gold">Au</a></b></div>79 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_mercury" title="Isotopes of mercury">Isotopes</a>  <a href="/wiki/Isotopes_of_mercury#List_of_isotopes" title="Isotopes of mercury">§ List</a></div><div style="display:block"><b><a href="/wiki/Mercury_(element)" title="Mercury (element)">Hg</a></b></div>80 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_thallium" title="Isotopes of thallium">Isotopes</a>  <a href="/wiki/Isotopes_of_thallium#List_of_isotopes" title="Isotopes of thallium">§ List</a></div><div style="display:block"><b><a href="/wiki/Thallium" title="Thallium">Tl</a></b></div>81 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_lead" title="Isotopes of lead">Isotopes</a>  <a href="/wiki/Isotopes_of_lead#List_of_isotopes" title="Isotopes of lead">§ List</a></div><div style="display:block"><b><a href="/wiki/Lead" title="Lead">Pb</a></b></div>82 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_bismuth" title="Isotopes of bismuth">Isotopes</a>  <a href="/wiki/Isotopes_of_bismuth#List_of_isotopes" title="Isotopes of bismuth">§ List</a></div><div style="display:block"><b><a href="/wiki/Bismuth" title="Bismuth">Bi</a></b></div>83 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_polonium" title="Isotopes of polonium">Isotopes</a>  <a href="/wiki/Isotopes_of_polonium#List_of_isotopes" title="Isotopes of polonium">§ List</a></div><div style="display:block"><b><a href="/wiki/Polonium" title="Polonium">Po</a></b></div>84 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_astatine" title="Isotopes of astatine">Isotopes</a>  <a href="/wiki/Isotopes_of_astatine#List_of_isotopes" title="Isotopes of astatine">§ List</a></div><div style="display:block"><b><a href="/wiki/Astatine" title="Astatine">At</a></b></div>85 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_radon" title="Isotopes of radon">Isotopes</a>  <a href="/wiki/Isotopes_of_radon#List_of_isotopes" title="Isotopes of radon">§ List</a></div><div style="display:block"><b><a href="/wiki/Radon" title="Radon">Rn</a></b></div>86 </td></tr> <tr> <th style=""><span title="Period ⑦" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_7_element" title="Period 7 element">⑦</a></span> </th> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_francium" title="Isotopes of francium">Isotopes</a>  <a href="/wiki/Isotopes_of_francium#List_of_isotopes" title="Isotopes of francium">§ List</a></div><div style="display:block"><b><a href="/wiki/Francium" title="Francium">Fr</a></b></div>87 </td> <td style="padding-left:0.1em; background:#ff9999;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_radium" title="Isotopes of radium">Isotopes</a>  <a href="/wiki/Isotopes_of_radium#List_of_isotopes" title="Isotopes of radium">§ List</a></div><div style="display:block"><b><a href="/wiki/Radium" title="Radium">Ra</a></b></div>88 </td> <td style="text-align:center; vertical-align:middle; background:#9bff99;color:inherit;"><span class="skin-invert-image" typeof="mw:File"><span><img alt="1 asterisk" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/16px-Asterisks_2_%28vertical%29.svg.png" decoding="async" width="16" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/24px-Asterisks_2_%28vertical%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/32px-Asterisks_2_%28vertical%29.svg.png 2x" data-file-width="106" data-file-height="98" /></span></span> </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_lawrencium" title="Isotopes of lawrencium">Isotopes</a>  <a href="/wiki/Isotopes_of_lawrencium#List_of_isotopes" title="Isotopes of lawrencium">§ List</a></div><div style="display:block"><b><a href="/wiki/Lawrencium" title="Lawrencium">Lr</a></b></div>103 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_rutherfordium" title="Isotopes of rutherfordium">Isotopes</a>  <a href="/wiki/Isotopes_of_rutherfordium#List_of_isotopes" title="Isotopes of rutherfordium">§ List</a></div><div style="display:block"><b><a href="/wiki/Rutherfordium" title="Rutherfordium">Rf</a></b></div>104 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_dubnium" title="Isotopes of dubnium">Isotopes</a>  <a href="/wiki/Isotopes_of_dubnium#List_of_isotopes" title="Isotopes of dubnium">§ List</a></div><div style="display:block"><b><a href="/wiki/Dubnium" title="Dubnium">Db</a></b></div>105 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_seaborgium" title="Isotopes of seaborgium">Isotopes</a>  <a href="/wiki/Isotopes_of_seaborgium#List_of_isotopes" title="Isotopes of seaborgium">§ List</a></div><div style="display:block"><b><a href="/wiki/Seaborgium" title="Seaborgium">Sg</a></b></div>106 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_bohrium" title="Isotopes of bohrium">Isotopes</a>  <a href="/wiki/Isotopes_of_bohrium#List_of_isotopes" title="Isotopes of bohrium">§ List</a></div><div style="display:block"><b><a href="/wiki/Bohrium" title="Bohrium">Bh</a></b></div>107 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_hassium" title="Isotopes of hassium">Isotopes</a>  <a href="/wiki/Isotopes_of_hassium#List_of_isotopes" title="Isotopes of hassium">§ List</a></div><div style="display:block"><b><a href="/wiki/Hassium" title="Hassium">Hs</a></b></div>108 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_meitnerium" title="Isotopes of meitnerium">Isotopes</a>  <a href="/wiki/Isotopes_of_meitnerium#List_of_isotopes" title="Isotopes of meitnerium">§ List</a></div><div style="display:block"><b><a href="/wiki/Meitnerium" title="Meitnerium">Mt</a></b></div>109 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_darmstadtium" title="Isotopes of darmstadtium">Isotopes</a>  <a href="/wiki/Isotopes_of_darmstadtium#List_of_isotopes" title="Isotopes of darmstadtium">§ List</a></div><div style="display:block"><b><a href="/wiki/Darmstadtium" title="Darmstadtium">Ds</a></b></div>110 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_roentgenium" title="Isotopes of roentgenium">Isotopes</a>  <a href="/wiki/Isotopes_of_roentgenium#List_of_isotopes" title="Isotopes of roentgenium">§ List</a></div><div style="display:block"><b><a href="/wiki/Roentgenium" title="Roentgenium">Rg</a></b></div>111 </td> <td style="padding-left:0.1em; background:#99ccff;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_copernicium" title="Isotopes of copernicium">Isotopes</a>  <a href="/wiki/Isotopes_of_copernicium#List_of_isotopes" title="Isotopes of copernicium">§ List</a></div><div style="display:block"><b><a href="/wiki/Copernicium" title="Copernicium">Cn</a></b></div>112 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_nihonium" title="Isotopes of nihonium">Isotopes</a>  <a href="/wiki/Isotopes_of_nihonium#List_of_isotopes" title="Isotopes of nihonium">§ List</a></div><div style="display:block"><b><a href="/wiki/Nihonium" title="Nihonium">Nh</a></b></div>113 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_flerovium" title="Isotopes of flerovium">Isotopes</a>  <a href="/wiki/Isotopes_of_flerovium#List_of_isotopes" title="Isotopes of flerovium">§ List</a></div><div style="display:block"><b><a href="/wiki/Flerovium" title="Flerovium">Fl</a></b></div>114 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_moscovium" title="Isotopes of moscovium">Isotopes</a>  <a href="/wiki/Isotopes_of_moscovium#List_of_isotopes" title="Isotopes of moscovium">§ List</a></div><div style="display:block"><b><a href="/wiki/Moscovium" title="Moscovium">Mc</a></b></div>115 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_livermorium" title="Isotopes of livermorium">Isotopes</a>  <a href="/wiki/Isotopes_of_livermorium#List_of_isotopes" title="Isotopes of livermorium">§ List</a></div><div style="display:block"><b><a href="/wiki/Livermorium" title="Livermorium">Lv</a></b></div>116 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_tennessine" title="Isotopes of tennessine">Isotopes</a>  <a href="/wiki/Isotopes_of_tennessine#List_of_isotopes" title="Isotopes of tennessine">§ List</a></div><div style="display:block"><b><a href="/wiki/Tennessine" title="Tennessine">Ts</a></b></div>117 </td> <td style="padding-left:0.1em; background:#fdff8c;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_oganesson" title="Isotopes of oganesson">Isotopes</a>  <a href="/wiki/Isotopes_of_oganesson#List_of_isotopes" title="Isotopes of oganesson">§ List</a></div><div style="display:block"><b><a href="/wiki/Oganesson" title="Oganesson">Og</a></b></div>118 </td></tr> <tr> <th style=""><span title="Period ⑧" class="nounderlines" style="font-size:150%;"><a href="/wiki/Period_8_element" class="mw-redirect" title="Period 8 element">⑧</a></span> </th> <td style="padding-left:0.1em; background:#eee;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_ununennium" title="Isotopes of ununennium">Isotopes</a>  <a href="/wiki/Isotopes_of_ununennium#List_of_isotopes" title="Isotopes of ununennium">§ List</a></div><div style="display:block"><b><a href="/wiki/Ununennium" title="Ununennium">Uue</a></b></div>119 </td> <td style="padding-left:0.1em; background:#eee;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_unbinilium" title="Isotopes of unbinilium">Isotopes</a>  <a href="/wiki/Isotopes_of_unbinilium#List_of_isotopes" title="Isotopes of unbinilium">§ List</a></div><div style="display:block"><b><a href="/wiki/Unbinilium" title="Unbinilium">Ubn</a></b></div>120 </td></tr> <tr> <td colspan="20" style="height:1.4em;"> </td></tr> <tr> <td> </td> <td> </td> <td> </td> <td style="text-align:center; vertical-align:middle;"><span class="skin-invert-image" typeof="mw:File"><span><img alt="1 asterisk" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/16px-Asterisks_one.svg.png" decoding="async" width="16" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/24px-Asterisks_one.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/49/Asterisks_one.svg/32px-Asterisks_one.svg.png 2x" data-file-width="106" data-file-height="98" /></span></span> </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_lanthanum" title="Isotopes of lanthanum">Isotopes</a>  <a href="/wiki/Isotopes_of_lanthanum#List_of_isotopes" title="Isotopes of lanthanum">§ List</a></div><div style="display:block"><b><a href="/wiki/Lanthanum" title="Lanthanum">La</a></b></div>57 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_cerium" title="Isotopes of cerium">Isotopes</a>  <a href="/wiki/Isotopes_of_cerium#List_of_isotopes" title="Isotopes of cerium">§ List</a></div><div style="display:block"><b><a href="/wiki/Cerium" title="Cerium">Ce</a></b></div>58 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_praseodymium" title="Isotopes of praseodymium">Isotopes</a>  <a href="/wiki/Isotopes_of_praseodymium#List_of_isotopes" title="Isotopes of praseodymium">§ List</a></div><div style="display:block"><b><a href="/wiki/Praseodymium" title="Praseodymium">Pr</a></b></div>59 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_neodymium" title="Isotopes of neodymium">Isotopes</a>  <a href="/wiki/Isotopes_of_neodymium#List_of_isotopes" title="Isotopes of neodymium">§ List</a></div><div style="display:block"><b><a href="/wiki/Neodymium" title="Neodymium">Nd</a></b></div>60 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_promethium" title="Isotopes of promethium">Isotopes</a>  <a href="/wiki/Isotopes_of_promethium#List_of_isotopes" title="Isotopes of promethium">§ List</a></div><div style="display:block"><b><a href="/wiki/Promethium" title="Promethium">Pm</a></b></div>61 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_samarium" title="Isotopes of samarium">Isotopes</a>  <a href="/wiki/Isotopes_of_samarium#List_of_isotopes" title="Isotopes of samarium">§ List</a></div><div style="display:block"><b><a href="/wiki/Samarium" title="Samarium">Sm</a></b></div>62 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_europium" title="Isotopes of europium">Isotopes</a>  <a href="/wiki/Isotopes_of_europium#List_of_isotopes" title="Isotopes of europium">§ List</a></div><div style="display:block"><b><a href="/wiki/Europium" title="Europium">Eu</a></b></div>63 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_gadolinium" title="Isotopes of gadolinium">Isotopes</a>  <a href="/wiki/Isotopes_of_gadolinium#List_of_isotopes" title="Isotopes of gadolinium">§ List</a></div><div style="display:block"><b><a href="/wiki/Gadolinium" title="Gadolinium">Gd</a></b></div>64 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_terbium" title="Isotopes of terbium">Isotopes</a>  <a href="/wiki/Isotopes_of_terbium#List_of_isotopes" title="Isotopes of terbium">§ List</a></div><div style="display:block"><b><a href="/wiki/Terbium" title="Terbium">Tb</a></b></div>65 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_dysprosium" title="Isotopes of dysprosium">Isotopes</a>  <a href="/wiki/Isotopes_of_dysprosium#List_of_isotopes" title="Isotopes of dysprosium">§ List</a></div><div style="display:block"><b><a href="/wiki/Dysprosium" title="Dysprosium">Dy</a></b></div>66 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_holmium" title="Isotopes of holmium">Isotopes</a>  <a href="/wiki/Isotopes_of_holmium#List_of_isotopes" title="Isotopes of holmium">§ List</a></div><div style="display:block"><b><a href="/wiki/Holmium" title="Holmium">Ho</a></b></div>67 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_erbium" title="Isotopes of erbium">Isotopes</a>  <a href="/wiki/Isotopes_of_erbium#List_of_isotopes" title="Isotopes of erbium">§ List</a></div><div style="display:block"><b><a href="/wiki/Erbium" title="Erbium">Er</a></b></div>68 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_thulium" title="Isotopes of thulium">Isotopes</a>  <a href="/wiki/Isotopes_of_thulium#List_of_isotopes" title="Isotopes of thulium">§ List</a></div><div style="display:block"><b><a href="/wiki/Thulium" title="Thulium">Tm</a></b></div>69 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_ytterbium" title="Isotopes of ytterbium">Isotopes</a>  <a href="/wiki/Isotopes_of_ytterbium#List_of_isotopes" title="Isotopes of ytterbium">§ List</a></div><div style="display:block"><b><a href="/wiki/Ytterbium" title="Ytterbium">Yb</a></b></div>70 </td> <td>  </td></tr> <tr> <td colspan="3"> </td> <td style="text-align:center; vertical-align:middle;"><span class="skin-invert-image" typeof="mw:File"><span><img alt="1 asterisk" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/16px-Asterisks_2_%28vertical%29.svg.png" decoding="async" width="16" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/24px-Asterisks_2_%28vertical%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Asterisks_2_%28vertical%29.svg/32px-Asterisks_2_%28vertical%29.svg.png 2x" data-file-width="106" data-file-height="98" /></span></span> </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_actinium" title="Isotopes of actinium">Isotopes</a>  <a href="/wiki/Isotopes_of_actinium#List_of_isotopes" title="Isotopes of actinium">§ List</a></div><div style="display:block"><b><a href="/wiki/Actinium" title="Actinium">Ac</a></b></div>89 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_thorium" title="Isotopes of thorium">Isotopes</a>  <a href="/wiki/Isotopes_of_thorium#List_of_isotopes" title="Isotopes of thorium">§ List</a></div><div style="display:block"><b><a href="/wiki/Thorium" title="Thorium">Th</a></b></div>90 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_protactinium" title="Isotopes of protactinium">Isotopes</a>  <a href="/wiki/Isotopes_of_protactinium#List_of_isotopes" title="Isotopes of protactinium">§ List</a></div><div style="display:block"><b><a href="/wiki/Protactinium" title="Protactinium">Pa</a></b></div>91 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_uranium" title="Isotopes of uranium">Isotopes</a>  <a href="/wiki/Isotopes_of_uranium#List_of_isotopes" title="Isotopes of uranium">§ List</a></div><div style="display:block"><b><a href="/wiki/Uranium" title="Uranium">U</a></b></div>92 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_neptunium" title="Isotopes of neptunium">Isotopes</a>  <a href="/wiki/Isotopes_of_neptunium#List_of_isotopes" title="Isotopes of neptunium">§ List</a></div><div style="display:block"><b><a href="/wiki/Neptunium" title="Neptunium">Np</a></b></div>93 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_plutonium" title="Isotopes of plutonium">Isotopes</a>  <a href="/wiki/Isotopes_of_plutonium#List_of_isotopes" title="Isotopes of plutonium">§ List</a></div><div style="display:block"><b><a href="/wiki/Plutonium" title="Plutonium">Pu</a></b></div>94 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_americium" title="Isotopes of americium">Isotopes</a>  <a href="/wiki/Isotopes_of_americium#List_of_isotopes" title="Isotopes of americium">§ List</a></div><div style="display:block"><b><a href="/wiki/Americium" title="Americium">Am</a></b></div>95 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_curium" title="Isotopes of curium">Isotopes</a>  <a href="/wiki/Isotopes_of_curium#List_of_isotopes" title="Isotopes of curium">§ List</a></div><div style="display:block"><b><a href="/wiki/Curium" title="Curium">Cm</a></b></div>96 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_berkelium" title="Isotopes of berkelium">Isotopes</a>  <a href="/wiki/Isotopes_of_berkelium#List_of_isotopes" title="Isotopes of berkelium">§ List</a></div><div style="display:block"><b><a href="/wiki/Berkelium" title="Berkelium">Bk</a></b></div>97 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_californium" title="Isotopes of californium">Isotopes</a>  <a href="/wiki/Isotopes_of_californium#List_of_isotopes" title="Isotopes of californium">§ List</a></div><div style="display:block"><b><a href="/wiki/Californium" title="Californium">Cf</a></b></div>98 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_einsteinium" title="Isotopes of einsteinium">Isotopes</a>  <a href="/wiki/Isotopes_of_einsteinium#List_of_isotopes" title="Isotopes of einsteinium">§ List</a></div><div style="display:block"><b><a href="/wiki/Einsteinium" title="Einsteinium">Es</a></b></div>99 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_fermium" title="Isotopes of fermium">Isotopes</a>  <a href="/wiki/Isotopes_of_fermium#List_of_isotopes" title="Isotopes of fermium">§ List</a></div><div style="display:block"><b><a href="/wiki/Fermium" title="Fermium">Fm</a></b></div>100 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_mendelevium" title="Isotopes of mendelevium">Isotopes</a>  <a href="/wiki/Isotopes_of_mendelevium#List_of_isotopes" title="Isotopes of mendelevium">§ List</a></div><div style="display:block"><b><a href="/wiki/Mendelevium" title="Mendelevium">Md</a></b></div>101 </td> <td style="padding-left:0.1em; background:#9bff99;color:inherit;"><div style="text-align:left"><a href="/wiki/Isotopes_of_nobelium" title="Isotopes of nobelium">Isotopes</a>  <a href="/wiki/Isotopes_of_nobelium#List_of_isotopes" title="Isotopes of nobelium">§ List</a></div><div style="display:block"><b><a href="/wiki/Nobelium" title="Nobelium">No</a></b></div>102 </td></tr></tbody></table> </div></td></tr><tr><td class="navbox-abovebelow hlist" colspan="2" style="background:#f0f0f0;color:inherit;"><div> <ul><li><a href="/wiki/Table_of_nuclides" title="Table of nuclides">Table of nuclides</a></li> <li>Categories: <a href="/wiki/Category:Isotopes" title="Category:Isotopes">Isotopes</a></li> <li><a href="/wiki/Category:Tables_of_nuclides" title="Category:Tables of nuclides">Tables of nuclides</a></li> <li><a href="/wiki/Category:Metastable_isotopes" title="Category:Metastable isotopes">Metastable isotopes</a></li> <li><a href="/wiki/Category:Lists_of_isotopes_by_element" title="Category:Lists of isotopes by element">Isotopes by element</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; 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