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vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_et_références"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Notes et références</span> </div> </a> <ul id="toc-Notes_et_références-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Sommaire" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Basculer la table des matières" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Basculer la table des matières</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Élément mononucléidique</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Aller à un article dans une autre langue. Disponible en 14 langues." > <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-14" 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">14 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B9%D9%86%D8%B5%D8%B1_%D8%A3%D8%AD%D8%A7%D8%AF%D9%8A_%D8%A7%D9%84%D9%86%D9%88%D9%8A%D8%AF%D8%A9" title="عنصر أحادي النويدة – arabe" lang="ar" hreflang="ar" data-title="عنصر أحادي النويدة" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Mononuklidick%C3%BD_prvek" title="Mononuklidický prvek – tchèque" lang="cs" hreflang="cs" data-title="Mononuklidický prvek" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Reinelement" title="Reinelement – allemand" lang="de" hreflang="de" data-title="Reinelement" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Mononuclidic_element" title="Mononuclidic element – anglais" lang="en" hreflang="en" data-title="Mononuclidic element" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Elemento_mononucleico" title="Elemento mononucleico – espagnol" lang="es" hreflang="es" data-title="Elemento mononucleico" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B9%D9%86%D8%B5%D8%B1_%D8%AA%DA%A9%E2%80%8C%D9%86%D9%88%DA%A9%D9%84%DB%8C%D8%AF" title="عنصر تک‌نوکلید – persan" lang="fa" hreflang="fa" data-title="عنصر تک‌نوکلید" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Unsur_mononuklida" title="Unsur mononuklida – indonésien" lang="id" hreflang="id" data-title="Unsur mononuklida" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonésien" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Elemento_mononuclidico" title="Elemento mononuclidico – italien" lang="it" hreflang="it" data-title="Elemento mononuclidico" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8D%98%E6%A0%B8%E7%A8%AE%E5%85%83%E7%B4%A0" title="単核種元素 – japonais" lang="ja" hreflang="ja" data-title="単核種元素" data-language-autonym="日本語" data-language-local-name="japonais" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Reinelement" title="Reinelement – bas-allemand" lang="nds" hreflang="nds" data-title="Reinelement" data-language-autonym="Plattdüütsch" data-language-local-name="bas-allemand" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Mononuclidisch_element" title="Mononuclidisch element – néerlandais" lang="nl" hreflang="nl" data-title="Mononuclidisch element" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Mononuclidic_element" title="Mononuclidic element – Simple English" lang="en-simple" hreflang="en-simple" data-title="Mononuclidic element" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Mononuklidick%C3%BD_prvok" title="Mononuklidický prvok – slovaque" lang="sk" hreflang="sk" data-title="Mononuklidický prvok" data-language-autonym="Slovenčina" data-language-local-name="slovaque" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%8D%95%E6%A0%B8%E7%B4%A0%E5%85%83%E7%B4%A0" title="单核素元素 – chinois" lang="zh" hreflang="zh" data-title="单核素元素" data-language-autonym="中文" data-language-local-name="chinois" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q337393#sitelinks-wikipedia" title="Modifier les liens interlangues" class="wbc-editpage">Modifier les liens</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> 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data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Apparence</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">masquer</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</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="fr" dir="ltr"><div class="bandeau-container metadata homonymie hatnote"><div class="bandeau-cell bandeau-icone" style="display:table-cell;padding-right:0.5em"><span class="noviewer" typeof="mw:File"><a href="/wiki/Aide:Homonymie" title="Aide:Homonymie"><img alt="Page d’aide sur l’homonymie" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Confusion_colour.svg/20px-Confusion_colour.svg.png" decoding="async" width="20" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Confusion_colour.svg/30px-Confusion_colour.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Confusion_colour.svg/40px-Confusion_colour.svg.png 2x" data-file-width="260" data-file-height="200" /></a></span></div><div class="bandeau-cell" style="display:table-cell;padding-right:0.5em"> <p>Ne doit pas être confondu avec <a href="/wiki/%C3%89l%C3%A9ment_monoisotopique" title="Élément monoisotopique">élément monoisotopique</a>, élément avec un seul isotope stable. </p> </div></div> <p>Un <b>élément mononucléidique</b> est un élément qui est naturellement présent sur Terre essentiellement sous la forme d'un seul <a href="/wiki/Nucl%C3%A9ide" title="Nucléide">nucléide</a>, que celui-ci soit stable ou non, et qui aura donc une masse atomique caractéristique. Ainsi, l'<a href="/wiki/Abondance_naturelle" title="Abondance naturelle">abondance naturelle</a> isotopique de cet élément sera dominé par un seul <a href="/wiki/Isotope_stable" title="Isotope stable">isotope stable</a> ou par un isotope instable à durée de vie très longue. Il existe 19 éléments dans la première catégorie (donc à la fois mononucléidiques et monoisotopiques) et 3 dans la seconde (mononucléidiques mais pas monoisotopiques) soit 22 éléments mononucléidiques au total. </p><p>Sur les 26 éléments monoisotopiques, sept ne sont donc pas mononucléidiques. Ils ne possèdent bien qu'un seul isotope stable mais ils ont aussi un <a href="/wiki/Nucl%C3%A9ide_primordial" title="Nucléide primordial">radioisotope primordial</a> de durée de vie très longue, qui coexiste avec l'<span class="page_h"><a href="/wiki/%C3%89l%C3%A9ment_stable" class="mw-disambig" title="Élément stable">élément stable</a></span> dans une fraction significative, et dans de rares cas de façon majoritaire voire quasi exclusive. Ces éléments sont le <a href="/wiki/Vanadium" title="Vanadium">vanadium</a>, le <a href="/wiki/Rubidium" title="Rubidium">rubidium</a>, l'<a href="/wiki/Indium" title="Indium">indium</a>, le <a href="/wiki/Lanthane" title="Lanthane">lanthane</a>, l'<a href="/wiki/Europium" title="Europium">europium</a>, le <a href="/wiki/Rh%C3%A9nium" title="Rhénium">rhénium</a> et le <a href="/wiki/Lut%C3%A9cium" title="Lutécium">lutécium</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Utilisation_en_métrologie"><span id="Utilisation_en_m.C3.A9trologie"></span>Utilisation en métrologie</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&veaction=edit&section=1" title="Modifier la section : Utilisation en métrologie" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&action=edit&section=1" title="Modifier le code source de la section : Utilisation en métrologie"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Les éléments mononucléidiques ont une grande importance en science, et en particulier en <a href="/wiki/M%C3%A9trologie" title="Métrologie">métrologie</a>, car leur <a href="/wiki/Masse_atomique" title="Masse atomique">masse atomique</a> peut être <a href="/wiki/M%C3%A9trologie" title="Métrologie">mesurée</a> avec une grande précision, l'incertitude due à la présence possible d'un autre isotope dans un échantillon étant minimale<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite_crochet">[</span>1<span class="cite_crochet">]</span></a></sup>. </p> <div class="mw-heading mw-heading2"><h2 id="Contamination_par_des_traces_d'un_isotope_instable"><span id="Contamination_par_des_traces_d.27un_isotope_instable"></span>Contamination par des traces d'un isotope instable</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&veaction=edit&section=2" title="Modifier la section : Contamination par des traces d'un isotope instable" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&action=edit&section=2" title="Modifier le code source de la section : Contamination par des traces d'un isotope instable"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Des concentrations très faibles (traces) d'isotopes instables peuvent être trouvées dans des échantillons naturels d'éléments mononucléidiques. Par exemple, le <a href="/wiki/B%C3%A9ryllium_10" title="Béryllium 10">béryllium 10</a> (<sup>10</sup>Be), qui possède une <a href="/wiki/Demi-vie" title="Demi-vie">demi-vie</a> de 1,4 million d'années, est produit par les <a href="/wiki/Rayon_cosmique" class="mw-redirect" title="Rayon cosmique">rayons cosmiques</a> dans la haute <a href="/wiki/Atmosph%C3%A8re_terrestre" title="Atmosphère terrestre">atmosphère terrestre</a> ; l'<a href="/wiki/Iode_129" class="mw-redirect" title="Iode 129">iode 129</a> (<sup>129</sup>I), avec une <a href="/wiki/Demi-vie" title="Demi-vie">demi-vie</a> de 15,7 millions peut être produit par un nombre varié de mécanismes cosmogéniques ou nucléaires ; le <a href="/wiki/C%C3%A9sium_137" title="Césium 137">césium 137</a> (<sup>137</sup>Cs), avec une demi-vie de 30 ans, est produit par des réactions de <a href="/wiki/Fission_nucl%C3%A9aire" title="Fission nucléaire">fission nucléaire</a>. </p><p>Tout le <a href="/wiki/Plutonium" title="Plutonium">plutonium</a> présent dans la nature, en dehors des minerais d'uranium, est sous la forme d'un seul <a href="/wiki/Nucl%C3%A9ide_primordial" title="Nucléide primordial">nucléide primordial</a> radioactif, le <a href="/wiki/Plutonium_244" title="Plutonium 244">plutonium 244</a>, ce qui fait par définition du plutonium un élément mononucléidique. Cependant, en pratique, le très rare plutonium primordial a été largement contaminé par des isotopes (tels que le <a href="/wiki/Plutonium_239" title="Plutonium 239">plutonium 239</a>) produits par des neutrons des minerais d'uranium, des <a href="/wiki/R%C3%A9acteur_nucl%C3%A9aire" title="Réacteur nucléaire">réacteurs</a> ou des <a href="/wiki/Arme_nucl%C3%A9aire" title="Arme nucléaire">armes nucléaires</a> ce qui rend ce nucléide inutile en métrologie. Le plutonium n'est donc pas en règle générale listé comme mononucléidique du fait de son absence d'utilité comme mononucléidique. </p> <div class="mw-heading mw-heading2"><h2 id="Table_complète_des_éléments_mononucléidiques"><span id="Table_compl.C3.A8te_des_.C3.A9l.C3.A9ments_mononucl.C3.A9idiques"></span>Table complète des éléments mononucléidiques</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&veaction=edit&section=3" title="Modifier la section : Table complète des éléments mononucléidiques" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&action=edit&section=3" title="Modifier le code source de la section : Table complète des éléments mononucléidiques"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable" style="font-size:95%; white-space:nowrap"> <tbody><tr> <th>Élément </th> <th>Nucléide </th> <th><i>Z</i> (<a href="/wiki/Proton" title="Proton">p</a>) </th> <th><i>N</i> (<a href="/wiki/Neutron" title="Neutron">n</a>) </th> <th>Masse isotopique (<a href="/wiki/Unit%C3%A9_de_masse_atomique" class="mw-redirect" title="Unité de masse atomique">u</a>) </th></tr> <tr> <td><a href="/wiki/B%C3%A9ryllium" title="Béryllium">béryllium</a> </td> <td align="center"><a href="/wiki/B%C3%A9ryllium_9" class="mw-redirect" title="Béryllium 9"><sup>9</sup>Be</a> </td> <td align="center">4 </td> <td align="center">5 </td> <td>9,012182(3) </td></tr> <tr> <td><a href="/wiki/Fluor" title="Fluor">fluor</a> </td> <td align="center"><a href="/wiki/Fluor_19" class="mw-redirect" title="Fluor 19"><sup>19</sup>F</a> </td> <td align="center">9 </td> <td align="center">10 </td> <td>18,998 403 2(5) </td></tr> <tr> <td><a href="/wiki/Sodium" title="Sodium">sodium</a> </td> <td align="center"><a href="/wiki/Sodium_23" class="mw-redirect" title="Sodium 23"><sup>23</sup>Na</a> </td> <td align="center">11 </td> <td align="center">12 </td> <td>22,989770(2) </td></tr> <tr> <td><a href="/wiki/Aluminium" title="Aluminium">aluminium</a> </td> <td align="center"><a href="/wiki/Aluminium_27" class="mw-redirect" title="Aluminium 27"><sup>27</sup>Al</a> </td> <td align="center">13 </td> <td align="center">14 </td> <td>26,981538(2) </td></tr> <tr> <td><a href="/wiki/Phosphore" title="Phosphore">phosphore</a> </td> <td align="center"><a href="/wiki/Phosphore_31" class="mw-redirect" title="Phosphore 31"><sup>31</sup>P</a> </td> <td align="center">15 </td> <td align="center">16 </td> <td>30,973 761(2) </td></tr> <tr> <td><a href="/wiki/Scandium" title="Scandium">scandium</a> </td> <td align="center"><a href="/wiki/Scandium_45" class="mw-redirect" title="Scandium 45"><sup>45</sup>Sc</a> </td> <td align="center">21 </td> <td align="center">24 </td> <td>44,955910(8) </td></tr> <tr> <td><a href="/wiki/Mangan%C3%A8se" title="Manganèse">manganèse</a> </td> <td align="center"><a href="/wiki/Mangan%C3%A8se_55" class="mw-redirect" title="Manganèse 55"><sup>55</sup>Mn</a> </td> <td align="center">25 </td> <td align="center">30 </td> <td>54,938049(9) </td></tr> <tr> <td><a href="/wiki/Cobalt" title="Cobalt">cobalt</a> </td> <td align="center"><a href="/wiki/Cobalt_59" class="mw-redirect" title="Cobalt 59"><sup>59</sup>Co</a> </td> <td align="center">27 </td> <td align="center">32 </td> <td>58,933 200(9) </td></tr> <tr> <td><a href="/wiki/Arsenic" title="Arsenic">arsenic</a> </td> <td align="center"><a href="/wiki/Arsenic_75" class="mw-redirect" title="Arsenic 75"><sup>75</sup>As</a> </td> <td align="center">33 </td> <td align="center">42 </td> <td>74,92160(2) </td></tr> <tr> <td><a href="/wiki/Yttrium" title="Yttrium">yttrium</a> </td> <td align="center"><a href="/wiki/Yttrium_89" class="mw-redirect" title="Yttrium 89"><sup>89</sup>Y</a> </td> <td align="center">39 </td> <td align="center">50 </td> <td>88,90585(2) </td></tr> <tr> <td><a href="/wiki/Niobium" title="Niobium">niobium</a> </td> <td align="center"><a href="/wiki/Niobium_93" class="mw-redirect" title="Niobium 93"><sup>93</sup>Nb</a> </td> <td align="center">41 </td> <td align="center">52 </td> <td>92,90638(2) </td></tr> <tr> <td><a href="/wiki/Rhodium" title="Rhodium">rhodium</a> </td> <td align="center"><a href="/wiki/Rhodium_103" class="mw-redirect" title="Rhodium 103"><sup>103</sup>Rh</a> </td> <td align="center">45 </td> <td align="center">58 </td> <td>102,90550(2) </td></tr> <tr> <td><a href="/wiki/Iode" title="Iode">iode</a> </td> <td align="center"><a href="/wiki/Iode_127" class="mw-redirect" title="Iode 127"><sup>127</sup>I</a> </td> <td align="center">53 </td> <td align="center">74 </td> <td>126,904 47(3) </td></tr> <tr> <td><a href="/wiki/C%C3%A9sium" title="Césium">césium</a> </td> <td align="center"><a href="/wiki/C%C3%A9sium_133" class="mw-redirect" title="Césium 133"><sup>133</sup>Cs</a> </td> <td align="center">55 </td> <td align="center">78 </td> <td>132,90545(2) </td></tr> <tr> <td><a href="/wiki/Pras%C3%A9odyme" title="Praséodyme">praséodyme</a> </td> <td align="center"><a href="/wiki/Pras%C3%A9odyme_141" class="mw-redirect" title="Praséodyme 141"><sup>141</sup>Pr</a> </td> <td align="center">59 </td> <td align="center">82 </td> <td>140,90765(2) </td></tr> <tr> <td><a href="/wiki/Terbium" title="Terbium">terbium</a> </td> <td align="center"><a href="/wiki/Terbium_159" class="mw-redirect" title="Terbium 159"><sup>159</sup>Tb</a> </td> <td align="center">65 </td> <td align="center">94 </td> <td>158,925 34(2) </td></tr> <tr> <td><a href="/wiki/Holmium" title="Holmium">holmium</a> </td> <td align="center"><a href="/wiki/Holmium_165" class="mw-redirect" title="Holmium 165"><sup>165</sup>Ho</a> </td> <td align="center">67 </td> <td align="center">98 </td> <td>164,93032(2) </td></tr> <tr> <td><a href="/wiki/Thulium" title="Thulium">thulium</a> </td> <td align="center"><a href="/wiki/Thulium_169" class="mw-redirect" title="Thulium 169"><sup>169</sup>Tm</a> </td> <td align="center">69 </td> <td align="center">100 </td> <td>168,93421(2) </td></tr> <tr> <td><a href="/wiki/Or" title="Or">or</a> </td> <td align="center"><a href="/wiki/Or_197" class="mw-redirect" title="Or 197"><sup>197</sup>Au</a> </td> <td align="center">79 </td> <td align="center">118 </td> <td>196,966 55(2) </td></tr> <tr> <td><a href="/wiki/Bismuth" title="Bismuth">bismuth</a> </td> <td align="center"><a href="/wiki/Bismuth_209" title="Bismuth 209"><sup>209</sup>Bi</a> </td> <td align="center">83 </td> <td align="center">126 </td> <td>208,98038(2) </td> <td>radioactif </td></tr> <tr> <td><a href="/wiki/Thorium" title="Thorium">thorium</a> </td> <td align="center"><a href="/wiki/Thorium_232" title="Thorium 232"><sup>232</sup>Th</a> </td> <td align="center">90 </td> <td align="center">142 </td> <td>232,038 1(1) </td> <td>radioactif </td></tr> <tr> <td><a href="/wiki/Protactinium" title="Protactinium">protactinium</a> </td> <td align="center"><a href="/wiki/Protactinium_231" class="mw-redirect" title="Protactinium 231"><sup>231</sup>Pa</a> </td> <td align="center">91 </td> <td align="center">140 </td> <td>231,03588(2) </td> <td>radioactif </td></tr></tbody></table> <p>Données depuis <i><a rel="nofollow" class="external text" href="http://physics.nist.gov/PhysRefData/Compositions/">Atomic Weights and Isotopic Compositions</a></i>, ed, J. S. Coursey, D. J. Schwab and R. A. Dragoset, <a href="/wiki/National_Institute_of_Standards_and_Technology" title="National Institute of Standards and Technology">National Institute of Standards and Technology</a> (2005). </p> <div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&veaction=edit&section=4" title="Modifier la section : Notes et références" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89l%C3%A9ment_mononucl%C3%A9idique&action=edit&section=4" title="Modifier le code source de la section : Notes et références"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> Cet article est partiellement ou en totalité issu de l’article de Wikipédia en anglais intitulé <span class="plainlinks">« <a class="external text" href="https://en.wikipedia.org/wiki/Mononuclidic_element?oldid=433191568">Mononuclidic element</a> » <small>(<a class="external text" href="https://en.wikipedia.org/wiki/Mononuclidic_element?action=history">voir la liste des auteurs</a>)</small></span>.</li></ul> <div class="references-small decimal" style=""><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink noprint"><a href="#cite_ref-1">↑</a> </span><span class="reference-text">N. E. Holden, "Standard Atomic Weight Values for the Mononuclidic Elements - 2001," <a rel="nofollow" class="external text" href="https://www.osti.gov/bridge/servlets/purl/782053-S3nk8u/native/782053.pdf">BNL-NCS-68362</a>, <a href="/wiki/Brookhaven_National_Laboratory" class="mw-redirect" title="Brookhaven National Laboratory">Brookhaven National Laboratory</a> (2001)</span> </li> </ol></div> </div> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Physique" title="Portail de la physique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/24px-Circle-icons-physics-logo.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/36px-Circle-icons-physics-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/22/Circle-icons-physics-logo.svg/48px-Circle-icons-physics-logo.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Physique" title="Portail:Physique">Portail de la physique</a></span> </span></li> <li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Chimie" title="Portail de la chimie"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/24px-Nuvola_apps_edu_science.svg.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/36px-Nuvola_apps_edu_science.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/Nuvola_apps_edu_science.svg/48px-Nuvola_apps_edu_science.svg.png 2x" data-file-width="128" data-file-height="128" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Chimie" title="Portail:Chimie">Portail de la chimie</a></span> </span></li> </ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Ce document provient de « <a dir="ltr" href="https://fr.wikipedia.org/w/index.php?title=Élément_mononucléidique&oldid=211148612">https://fr.wikipedia.org/w/index.php?title=Élément_mononucléidique&oldid=211148612</a> ».</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Cat%C3%A9gorie:Accueil" title="Catégorie:Accueil">Catégories</a> : <ul><li><a href="/wiki/Cat%C3%A9gorie:Isotope" title="Catégorie:Isotope">Isotope</a></li><li><a href="/wiki/Cat%C3%A9gorie:M%C3%A9trologie" title="Catégorie:Métrologie">Métrologie</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Catégories cachées : <ul><li><a href="/wiki/Cat%C3%A9gorie:Portail:Physique/Articles_li%C3%A9s" title="Catégorie:Portail:Physique/Articles liés">Portail:Physique/Articles liés</a></li><li><a href="/wiki/Cat%C3%A9gorie:Portail:Sciences/Articles_li%C3%A9s" title="Catégorie:Portail:Sciences/Articles liés">Portail:Sciences/Articles liés</a></li><li><a href="/wiki/Cat%C3%A9gorie:Portail:Chimie/Articles_li%C3%A9s" title="Catégorie:Portail:Chimie/Articles liés">Portail:Chimie/Articles liés</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> La dernière modification de cette page a été faite le 3 janvier 2024 à 17:26.</li> <li id="footer-info-copyright"><span style="white-space: normal"><a href="/wiki/Wikip%C3%A9dia:Citation_et_r%C3%A9utilisation_du_contenu_de_Wikip%C3%A9dia" title="Wikipédia:Citation et réutilisation du contenu de Wikipédia">Droit d'auteur</a> : les textes sont disponibles sous <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.fr">licence Creative Commons attribution, partage dans les mêmes conditions</a> ; d’autres conditions peuvent s’appliquer. 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