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id="toc-Nuclear_decay" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nuclear_decay"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Nuclear decay</span> </div> </a> <ul id="toc-Nuclear_decay-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nuclear_fusion" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nuclear_fusion"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Nuclear fusion</span> </div> </a> <ul id="toc-Nuclear_fusion-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nuclear_fission" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nuclear_fission"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Nuclear fission</span> </div> </a> <ul id="toc-Nuclear_fission-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Production_of_heavy_elements" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Production_of_heavy_elements"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Production of heavy elements</span> </div> </a> <ul id="toc-Production_of_heavy_elements-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Related_pages" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Related_pages"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Related pages</span> </div> </a> <ul id="toc-Related_pages-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_websites" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Other_websites"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Other websites</span> </div> </a> <ul id="toc-Other_websites-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="Contents" 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="Toggle the table of contents" > <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">Toggle the table of contents</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">Atomic nucleus</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="Go to an article in another language. Available in 120 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-120" 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">120 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Atoomkern" title="Atoomkern – Afrikaans" lang="af" hreflang="af" data-title="Atoomkern" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-anp mw-list-item"><a href="https://anp.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A4%AE%E0%A4%BE%E0%A4%A3%E0%A5%81_%E0%A4%A8%E0%A4%BE%E0%A4%AD%E0%A4%BF%E0%A4%95" title="परमाणु नाभिक – Angika" lang="anp" hreflang="anp" data-title="परमाणु नाभिक" data-language-autonym="अंगिका" data-language-local-name="Angika" class="interlanguage-link-target"><span>अंगिका</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D9%88%D8%A7%D8%A9_%D8%A7%D9%84%D8%B0%D8%B1%D8%A9" title="نواة الذرة – Arabic" lang="ar" hreflang="ar" data-title="نواة الذرة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Nucleu_at%C3%B3micu" title="Nucleu atómicu – Asturian" lang="ast" hreflang="ast" data-title="Nucleu atómicu" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Atomun_n%C3%BCv%C9%99si" title="Atomun nüvəsi – Azerbaijani" lang="az" hreflang="az" data-title="Atomun nüvəsi" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%A2%D8%AA%D9%88%D9%85_%DA%86%DA%A9%DB%8C%D8%B1%D8%AF%DA%AF%DB%8C" title="آتوم چکیردگی – South Azerbaijani" lang="azb" hreflang="azb" data-title="آتوم چکیردگی" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AA%E0%A6%BE%E0%A6%B0%E0%A6%AE%E0%A6%BE%E0%A6%A3%E0%A6%AC%E0%A6%BF%E0%A6%95_%E0%A6%A8%E0%A6%BF%E0%A6%89%E0%A6%95%E0%A7%8D%E0%A6%B2%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%B8" title="পারমাণবিক নিউক্লিয়াস – Bangla" lang="bn" hreflang="bn" data-title="পারমাণবিক নিউক্লিয়াস" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Go%C3%A2n-ch%C3%BA-hu%CC%8Dt" title="Goân-chú-hu̍t – Minnan" lang="nan" hreflang="nan" data-title="Goân-chú-hu̍t" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-map-bms mw-list-item"><a href="https://map-bms.wikipedia.org/wiki/Nukleus" title="Nukleus – Banyumasan" lang="jv-x-bms" hreflang="jv-x-bms" data-title="Nukleus" data-language-autonym="Basa Banyumasan" data-language-local-name="Banyumasan" class="interlanguage-link-target"><span>Basa Banyumasan</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%90%D1%82%D0%B0%D0%BC%D0%BD%D0%B0%D0%B5_%D1%8F%D0%B4%D1%80%D0%BE" title="Атамнае ядро – Belarusian" lang="be" hreflang="be" data-title="Атамнае ядро" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%90%D1%82%D0%B0%D0%BC%D0%BD%D0%B0%D0%B5_%D1%8F%D0%B4%D1%80%D0%BE" title="Атамнае ядро – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Атамнае ядро" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A4%AE%E0%A4%BE%E0%A4%A3%E0%A4%B5%E0%A4%BF%E0%A4%95_%E0%A4%AA%E0%A4%A6%E0%A4%B0%E0%A5%8D%E0%A4%A5%E0%A4%AC%E0%A4%BF%E0%A4%A6%E0%A5%8D%E0%A4%AF%E0%A4%BE" title="परमाणविक पदर्थबिद्या – Bhojpuri" lang="bh" hreflang="bh" data-title="परमाणविक पदर्थबिद्या" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Atomikong_nukleyus" title="Atomikong nukleyus – Central Bikol" lang="bcl" hreflang="bcl" data-title="Atomikong nukleyus" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BD%D0%BE_%D1%8F%D0%B4%D1%80%D0%BE" title="Атомно ядро – Bulgarian" lang="bg" hreflang="bg" data-title="Атомно ядро" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Atomsko_jezgro" title="Atomsko jezgro – Bosnian" lang="bs" hreflang="bs" data-title="Atomsko jezgro" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Nukle%C3%BCs_(an_atomo%C3%B9)" title="Nukleüs (an atomoù) – Breton" lang="br" hreflang="br" data-title="Nukleüs (an atomoù)" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Nucli_at%C3%B2mic" title="Nucli atòmic – Catalan" lang="ca" hreflang="ca" data-title="Nucli atòmic" 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%9D%D1%83%D0%BA%D0%BB%D0%BE%D0%BD%D1%81%D0%B0%D1%80" title="Нуклонсар – Chuvash" lang="cv" hreflang="cv" data-title="Нуклонсар" 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/Atomov%C3%A9_j%C3%A1dro" title="Atomové jádro – Czech" lang="cs" hreflang="cs" data-title="Atomové jádro" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-co mw-list-item"><a href="https://co.wikipedia.org/wiki/Nucleu_Atomicu" title="Nucleu Atomicu – Corsican" lang="co" hreflang="co" data-title="Nucleu Atomicu" data-language-autonym="Corsu" data-language-local-name="Corsican" class="interlanguage-link-target"><span>Corsu</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Niwclews_atomig" title="Niwclews atomig – Welsh" lang="cy" hreflang="cy" data-title="Niwclews atomig" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Atomkerne" title="Atomkerne – Danish" lang="da" hreflang="da" data-title="Atomkerne" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D9%86%D9%88%D9%8A%D8%A9_%D8%AF_%D8%AF%D8%B1%D8%A9" title="نوية د درة – Moroccan Arabic" lang="ary" hreflang="ary" data-title="نوية د درة" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Atomkern" title="Atomkern – German" lang="de" hreflang="de" data-title="Atomkern" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Aatomituum" title="Aatomituum – Estonian" lang="et" hreflang="et" data-title="Aatomituum" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%91%CF%84%CE%BF%CE%BC%CE%B9%CE%BA%CF%8C%CF%82_%CF%80%CF%85%CF%81%CE%AE%CE%BD%CE%B1%CF%82" title="Ατομικός πυρήνας – Greek" lang="el" hreflang="el" data-title="Ατομικός πυρήνας" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Atomic_nucleus" title="Atomic nucleus – English" lang="en" hreflang="en" data-title="Atomic nucleus" data-language-autonym="English" data-language-local-name="English" 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/N%C3%BAcleo_at%C3%B3mico" title="Núcleo atómico – Spanish" lang="es" hreflang="es" data-title="Núcleo atómico" 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/Atomkerno" title="Atomkerno – Esperanto" lang="eo" hreflang="eo" data-title="Atomkerno" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Atomo_nukleo" title="Atomo nukleo – Basque" lang="eu" hreflang="eu" data-title="Atomo nukleo" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%87%D8%B3%D8%AA%D9%87_%D8%A7%D8%AA%D9%85" title="هسته اتم – Persian" lang="fa" hreflang="fa" data-title="هسته اتم" 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/Noyau_atomique" title="Noyau atomique – French" lang="fr" hreflang="fr" data-title="Noyau atomique" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Atoomkearn" title="Atoomkearn – Western Frisian" lang="fy" hreflang="fy" data-title="Atoomkearn" data-language-autonym="Frysk" data-language-local-name="Western Frisian" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/N%C3%BAicl%C3%A9as_adamhach" title="Núicléas adamhach – Irish" lang="ga" hreflang="ga" data-title="Núicléas adamhach" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/Ni%C3%B9clas" title="Niùclas – Scottish Gaelic" lang="gd" hreflang="gd" data-title="Niùclas" data-language-autonym="Gàidhlig" data-language-local-name="Scottish Gaelic" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/N%C3%BAcleo_at%C3%B3mico" title="Núcleo atómico – Galician" lang="gl" hreflang="gl" data-title="Núcleo atómico" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9B%90%EC%9E%90%ED%95%B5" title="원자핵 – Korean" lang="ko" hreflang="ko" data-title="원자핵" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%84%D5%AB%D5%BB%D5%B8%D6%82%D5%AF_(%D5%A1%D5%BF%D5%B8%D5%B4)" title="Միջուկ (ատոմ) – Armenian" lang="hy" hreflang="hy" data-title="Միջուկ (ատոմ)" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A4%AE%E0%A4%BE%E0%A4%A3%E0%A5%81_%E0%A4%A8%E0%A4%BE%E0%A4%AD%E0%A4%BF%E0%A4%95" title="परमाणु नाभिक – Hindi" lang="hi" hreflang="hi" data-title="परमाणु नाभिक" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Atomska_jezgra" title="Atomska jezgra – Croatian" lang="hr" hreflang="hr" data-title="Atomska jezgra" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Nukleo_atomala" title="Nukleo atomala – Ido" lang="io" hreflang="io" data-title="Nukleo atomala" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Inti_atom" title="Inti atom – Indonesian" lang="id" hreflang="id" data-title="Inti atom" 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-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Nucleo_atomic" title="Nucleo atomic – Interlingua" lang="ia" hreflang="ia" data-title="Nucleo atomic" data-language-autonym="Interlingua" data-language-local-name="Interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-zu mw-list-item"><a href="https://zu.wikipedia.org/wiki/INuzi_lechwe" title="INuzi lechwe – Zulu" lang="zu" hreflang="zu" data-title="INuzi lechwe" data-language-autonym="IsiZulu" data-language-local-name="Zulu" class="interlanguage-link-target"><span>IsiZulu</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Frumeindakjarni" title="Frumeindakjarni – Icelandic" lang="is" hreflang="is" data-title="Frumeindakjarni" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Nucleo_atomico" title="Nucleo atomico – Italian" lang="it" hreflang="it" data-title="Nucleo atomico" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%92%D7%A8%D7%A2%D7%99%D7%9F_%D7%94%D7%90%D7%98%D7%95%D7%9D" title="גרעין האטום – Hebrew" lang="he" hreflang="he" data-title="גרעין האטום" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Inti_Atom" title="Inti Atom – Javanese" lang="jv" hreflang="jv" data-title="Inti Atom" data-language-autonym="Jawa" data-language-local-name="Javanese" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%AC%E0%B3%88%E0%B2%9C%E0%B2%BF%E0%B2%95_%E0%B2%95%E0%B3%87%E0%B2%82%E0%B2%A6%E0%B3%8D%E0%B2%B0" title="ಬೈಜಿಕ ಕೇಂದ್ರ – Kannada" lang="kn" hreflang="kn" data-title="ಬೈಜಿಕ ಕೇಂದ್ರ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="Kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%90%E1%83%A2%E1%83%9D%E1%83%9B%E1%83%98%E1%83%A1_%E1%83%91%E1%83%98%E1%83%A0%E1%83%97%E1%83%95%E1%83%98" title="ატომის ბირთვი – Georgian" lang="ka" hreflang="ka" data-title="ატომის ბირთვი" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/%DA%A9%D9%86%DB%81%D9%95_%D9%85%D9%95%D8%B1" title="کنہٕ مٕر – Kashmiri" lang="ks" hreflang="ks" data-title="کنہٕ مٕر" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="Kashmiri" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC_%D1%8F%D0%B4%D1%80%D0%BE%D1%81%D1%8B" title="Атом ядросы – Kazakh" lang="kk" hreflang="kk" data-title="Атом ядросы" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Kiini_cha_atomu" title="Kiini cha atomu – Swahili" lang="sw" hreflang="sw" data-title="Kiini cha atomu" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Nwayo_atomik" title="Nwayo atomik – Haitian Creole" lang="ht" hreflang="ht" data-title="Nwayo atomik" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Navok" title="Navok – Kurdish" lang="ku" hreflang="ku" data-title="Navok" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lo mw-list-item"><a href="https://lo.wikipedia.org/wiki/%E0%BB%81%E0%BA%81%E0%BA%99%E0%BA%9B%E0%BA%B0%E0%BA%A5%E0%BB%8D%E0%BA%B2%E0%BA%A1%E0%BA%B0%E0%BA%99%E0%BA%B9" title="ແກນປະລໍາມະນູ – Lao" lang="lo" hreflang="lo" data-title="ແກນປະລໍາມະນູ" data-language-autonym="ລາວ" data-language-local-name="Lao" class="interlanguage-link-target"><span>ລາວ</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Nucleus_atomi" title="Nucleus atomi – Latin" lang="la" hreflang="la" data-title="Nucleus atomi" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Atoma_kodols" title="Atoma kodols – Latvian" lang="lv" hreflang="lv" data-title="Atoma kodols" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Atomo_branduolys" title="Atomo branduolys – Lithuanian" lang="lt" hreflang="lt" data-title="Atomo branduolys" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Atoamkaen" title="Atoamkaen – Limburgish" lang="li" hreflang="li" data-title="Atoamkaen" data-language-autonym="Limburgs" data-language-local-name="Limburgish" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-ln mw-list-item"><a href="https://ln.wikipedia.org/wiki/Mok%C3%B3k%C3%B3l%C3%B3_mwa_atome" title="Mokókóló mwa atome – Lingala" lang="ln" hreflang="ln" data-title="Mokókóló mwa atome" data-language-autonym="Lingála" data-language-local-name="Lingala" class="interlanguage-link-target"><span>Lingála</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Nucli_(fisega)" title="Nucli (fisega) – Lombard" lang="lmo" hreflang="lmo" data-title="Nucli (fisega)" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Atommag" title="Atommag – Hungarian" lang="hu" hreflang="hu" data-title="Atommag" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%BE_%D1%98%D0%B0%D0%B4%D1%80%D0%BE" title="Атомско јадро – Macedonian" lang="mk" hreflang="mk" data-title="Атомско јадро" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%85%E0%B4%A3%E0%B5%81%E0%B4%95%E0%B5%87%E0%B4%A8%E0%B5%8D%E0%B4%A6%E0%B5%8D%E0%B4%B0%E0%B4%82" title="അണുകേന്ദ്രം – Malayalam" lang="ml" hreflang="ml" data-title="അണുകേന്ദ്രം" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%85%E0%A4%A3%E0%A5%81%E0%A4%95%E0%A5%87%E0%A4%82%E0%A4%A6%E0%A5%8D%E0%A4%B0" title="अणुकेंद्र – Marathi" lang="mr" hreflang="mr" data-title="अणुकेंद्र" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Nukleus_atom" title="Nukleus atom – Malay" lang="ms" hreflang="ms" data-title="Nukleus atom" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Ngu%C3%B2ng-c%E1%B9%B3%CC%84_h%C5%8Fk" title="Nguòng-cṳ̄ hŏk – Mindong" lang="cdo" hreflang="cdo" data-title="Nguòng-cṳ̄ hŏk" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%8B%D0%BD_%D1%86%D3%A9%D0%BC" title="Атомын цөм – Mongolian" lang="mn" hreflang="mn" data-title="Атомын цөм" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%80%E1%80%BA%E1%80%BA%E1%80%90%E1%80%99%E1%80%BA%E1%81%8F_%E1%80%94%E1%80%BB%E1%80%B0%E1%80%80%E1%80%9C%E1%80%AD%E1%80%9A" title="အက််တမ်၏ နျူကလိယ – Burmese" lang="my" hreflang="my" data-title="အက််တမ်၏ နျူကလိယ" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Atoomkern" title="Atoomkern – Dutch" lang="nl" hreflang="nl" data-title="Atoomkern" 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/%E5%8E%9F%E5%AD%90%E6%A0%B8" title="原子核 – Japanese" lang="ja" hreflang="ja" data-title="原子核" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Atomkjerne" title="Atomkjerne – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Atomkjerne" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Atomkjerne" title="Atomkjerne – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Atomkjerne" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-nov mw-list-item"><a href="https://nov.wikipedia.org/wiki/Nukleus" title="Nukleus – Novial" lang="nov" hreflang="nov" data-title="Nukleus" data-language-autonym="Novial" data-language-local-name="Novial" class="interlanguage-link-target"><span>Novial</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Nucl%C3%A8u_atomic" title="Nuclèu atomic – Occitan" lang="oc" hreflang="oc" data-title="Nuclèu atomic" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-mhr mw-list-item"><a href="https://mhr.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC_%D1%82%D0%BE%D0%BC" title="Атом том – Eastern Mari" lang="mhr" hreflang="mhr" data-title="Атом том" data-language-autonym="Олык марий" data-language-local-name="Eastern Mari" class="interlanguage-link-target"><span>Олык марий</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Niwukilasii_atoomii" title="Niwukilasii atoomii – Oromo" lang="om" hreflang="om" data-title="Niwukilasii atoomii" data-language-autonym="Oromoo" data-language-local-name="Oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Atom_yadrosi" title="Atom yadrosi – Uzbek" lang="uz" hreflang="uz" data-title="Atom yadrosi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AA%E0%A8%B0%E0%A8%AE%E0%A8%BE%E0%A8%A3%E0%A9%82_%E0%A8%A8%E0%A8%BE%E0%A8%AD" title="ਪਰਮਾਣੂ ਨਾਭ – Punjabi" lang="pa" hreflang="pa" data-title="ਪਰਮਾਣੂ ਨਾਭ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A7%DB%8C%D9%B9%D9%85%DB%8C_%D9%86%DB%8C%D9%88%DA%A9%D9%84%DB%8C%D8%B3" title="ایٹمی نیوکلیس – Western Punjabi" lang="pnb" hreflang="pnb" data-title="ایٹمی نیوکلیس" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-blk mw-list-item"><a href="https://blk.wikipedia.org/wiki/%E1%80%94%E1%80%BB%E1%80%B0%E1%80%B8%E1%80%80%E1%80%9C%E1%80%AE%E1%80%B8%E1%80%9A%E1%80%95%E1%80%BA" title="နျူးကလီးယပ် – Pa'O" lang="blk" hreflang="blk" data-title="နျူးကလီးယပ်" data-language-autonym="ပအိုဝ်ႏဘာႏသာႏ" data-language-local-name="Pa'O" class="interlanguage-link-target"><span>ပအိုဝ်ႏဘာႏသာႏ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/J%C4%85dro_atomowe" title="Jądro atomowe – Polish" lang="pl" hreflang="pl" data-title="Jądro atomowe" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/N%C3%BAcleo_at%C3%B3mico" title="Núcleo atómico – Portuguese" lang="pt" hreflang="pt" data-title="Núcleo atómico" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Nucleu_atomic" title="Nucleu atomic – Romanian" lang="ro" hreflang="ro" data-title="Nucleu atomic" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/I%C3%B1uku_huk%27i" title="Iñuku huk'i – Quechua" lang="qu" hreflang="qu" data-title="Iñuku huk'i" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BE%D0%B2%D0%B5_%D1%8F%D0%B4%D1%80%D0%BE" title="Атомове ядро – Rusyn" lang="rue" hreflang="rue" data-title="Атомове ядро" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D0%BD%D0%BE%D0%B5_%D1%8F%D0%B4%D1%80%D0%BE" title="Атомное ядро – Russian" lang="ru" hreflang="ru" data-title="Атомное ядро" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Atomic_nucleus" title="Atomic nucleus – Scots" lang="sco" hreflang="sco" data-title="Atomic nucleus" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-stq mw-list-item"><a href="https://stq.wikipedia.org/wiki/Atomk%C3%A4%C3%A4den" title="Atomkääden – Saterland Frisian" lang="stq" hreflang="stq" data-title="Atomkääden" data-language-autonym="Seeltersk" data-language-local-name="Saterland Frisian" class="interlanguage-link-target"><span>Seeltersk</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/B%C3%ABrthama_e_atomit" title="Bërthama e atomit – Albanian" lang="sq" hreflang="sq" data-title="Bërthama e atomit" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%A7%D9%8A%D9%BD%D9%85%D9%8A_%D9%86%D9%8A%D9%88%DA%AA%D9%84%D9%8A%D8%B3" title="ايٽمي نيوڪليس – Sindhi" lang="sd" hreflang="sd" data-title="ايٽمي نيوڪليس" data-language-autonym="سنڌي" data-language-local-name="Sindhi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/At%C3%B3mov%C3%A9_jadro" title="Atómové jadro – Slovak" lang="sk" hreflang="sk" data-title="Atómové jadro" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Atomsko_jedro" title="Atomsko jedro – Slovenian" lang="sl" hreflang="sl" data-title="Atomsko jedro" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%BE_%D1%98%D0%B5%D0%B7%D0%B3%D1%80%D0%BE" title="Атомско језгро – Serbian" lang="sr" hreflang="sr" data-title="Атомско језгро" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Atomsko_jezgro" title="Atomsko jezgro – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Atomsko jezgro" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Inti_atom" title="Inti atom – Sundanese" lang="su" hreflang="su" data-title="Inti atom" data-language-autonym="Sunda" data-language-local-name="Sundanese" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Atomiydin" title="Atomiydin – Finnish" lang="fi" hreflang="fi" data-title="Atomiydin" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Atomk%C3%A4rna" title="Atomkärna – Swedish" lang="sv" hreflang="sv" data-title="Atomkärna" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Atomikong_nukleyus" title="Atomikong nukleyus – Tagalog" lang="tl" hreflang="tl" data-title="Atomikong nukleyus" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%85%E0%AE%A3%E0%AF%81%E0%AE%95%E0%AF%8D%E0%AE%95%E0%AE%B0%E0%AF%81" title="அணுக்கரு – Tamil" lang="ta" hreflang="ta" data-title="அணுக்கரு" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/A%C9%A3yay_abelkam" title="Aɣyay abelkam – Kabyle" lang="kab" hreflang="kab" data-title="Aɣyay abelkam" data-language-autonym="Taqbaylit" data-language-local-name="Kabyle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%AA%E0%B0%B0%E0%B0%AE%E0%B0%BE%E0%B0%A3%E0%B1%81_%E0%B0%95%E0%B1%87%E0%B0%82%E0%B0%A6%E0%B1%8D%E0%B0%B0%E0%B0%95%E0%B0%82" title="పరమాణు కేంద్రకం – Telugu" lang="te" hreflang="te" data-title="పరమాణు కేంద్రకం" data-language-autonym="తెలుగు" data-language-local-name="Telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%99%E0%B8%B4%E0%B8%A7%E0%B9%80%E0%B8%84%E0%B8%A5%E0%B8%B5%E0%B8%A2%E0%B8%AA%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B8%AD%E0%B8%B0%E0%B8%95%E0%B8%AD%E0%B8%A1" title="นิวเคลียสของอะตอม – Thai" lang="th" hreflang="th" data-title="นิวเคลียสของอะตอม" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Atom_%C3%A7ekirde%C4%9Fi" title="Atom çekirdeği – Turkish" lang="tr" hreflang="tr" data-title="Atom çekirdeği" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://uk.wikipedia.org/wiki/%D0%AF%D0%B4%D1%80%D0%BE_%D0%B0%D1%82%D0%BE%D0%BC%D0%B0" title="Ядро атома – Ukrainian" lang="uk" hreflang="uk" data-title="Ядро атома" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%AC%D9%88%DB%81%D8%B1%DB%8C_%D9%86%D9%88%DB%8C%DB%81" title="جوہری نویہ – Urdu" lang="ur" hreflang="ur" data-title="جوہری نویہ" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/Yenzswjhaed" title="Yenzswjhaed – Zhuang" lang="za" hreflang="za" data-title="Yenzswjhaed" data-language-autonym="Vahcuengh" data-language-local-name="Zhuang" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/H%E1%BA%A1t_nh%C3%A2n_nguy%C3%AAn_t%E1%BB%AD" title="Hạt nhân nguyên tử – Vietnamese" lang="vi" hreflang="vi" data-title="Hạt nhân nguyên tử" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-fiu-vro mw-list-item"><a href="https://fiu-vro.wikipedia.org/wiki/Aadomis%C3%A4s%C3%BC" title="Aadomisäsü – Võro" lang="vro" hreflang="vro" data-title="Aadomisäsü" data-language-autonym="Võro" data-language-local-name="Võro" class="interlanguage-link-target"><span>Võro</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E6%A0%B8" title="原子核 – Literary Chinese" lang="lzh" hreflang="lzh" data-title="原子核" data-language-autonym="文言" data-language-local-name="Literary Chinese" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-war badge-Q70893996 mw-list-item" title=""><a href="https://war.wikipedia.org/wiki/Nukleyus_hin_atomo" title="Nukleyus hin atomo – Waray" lang="war" hreflang="war" data-title="Nukleyus hin atomo" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E6%A0%B8" title="原子核 – Wu" lang="wuu" hreflang="wuu" data-title="原子核" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%90%D7%98%D7%90%D7%9E%D7%A7%D7%A2%D7%A8%D7%9F" title="אטאמקערן – Yiddish" lang="yi" hreflang="yi" data-title="אטאמקערן" data-language-autonym="ייִדיש" data-language-local-name="Yiddish" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/N%C3%BAkl%C3%A9%C3%B9_%C3%A1t%E1%BB%8D%CC%80m%C3%B9" title="Núkléù átọ̀mù – Yoruba" lang="yo" hreflang="yo" data-title="Núkléù átọ̀mù" data-language-autonym="Yorùbá" data-language-local-name="Yoruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E6%A0%B8" title="原子核 – Cantonese" lang="yue" hreflang="yue" data-title="原子核" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Dend%C4%B1k%C3%AA_atomi" title="Dendıkê atomi – Zazaki" lang="diq" hreflang="diq" data-title="Dendıkê atomi" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/Atuoma_kondouls" title="Atuoma kondouls – Samogitian" lang="sgs" hreflang="sgs" data-title="Atuoma kondouls" data-language-autonym="Žemaitėška" data-language-local-name="Samogitian" class="interlanguage-link-target"><span>Žemaitėška</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%8E%9F%E5%AD%90%E6%A0%B8" title="原子核 – Chinese" lang="zh" hreflang="zh" data-title="原子核" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zgh mw-list-item"><a href="https://zgh.wikipedia.org/wiki/%E2%B5%93%E2%B5%A5%E2%B5%8E_%E2%B4%B0%E2%B5%A1%E2%B4%B1%E2%B5%8D%E2%B4%BD%E2%B5%89%E2%B5%8E" title="ⵓⵥⵎ ⴰⵡⴱⵍⴽⵉⵎ – Standard Moroccan Tamazight" lang="zgh" hreflang="zgh" data-title="ⵓⵥⵎ ⴰⵡⴱⵍⴽⵉⵎ" data-language-autonym="ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ" data-language-local-name="Standard Moroccan Tamazight" class="interlanguage-link-target"><span>ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit 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data-mw-deduplicate="TemplateStyles:r8538344">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}html.client-js body.skin-minerva .mw-parser-output .mbox-text-span{margin-left:23px!important}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}</style><table class="box-More_footnotes plainlinks metadata ambox ambox-style" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Text_document_with_red_question_mark.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/40px-Text_document_with_red_question_mark.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/60px-Text_document_with_red_question_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/80px-Text_document_with_red_question_mark.svg.png 2x" data-file-width="48" data-file-height="48" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article includes a <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">list of references</a> or <a href="/wiki/Wikipedia:External_links" class="mw-redirect" title="Wikipedia:External links">other websites</a>, but <b>its sources remain unclear because it does not have enough <a href="/wiki/Wikipedia:Citing_sources#Adding_the_citation" title="Wikipedia:Citing sources">inline citations</a></b>.<span class="hide-when-compact"> Please help to improve this article by introducing more precise citations <a href="https://en.wikipedia.org/wiki/Wikipedia:When_to_cite" class="extiw" title="en:Wikipedia:When to cite">where appropriate</a>.</span> <span class="date-container"><i>(<span class="date">June 2008</span>)</i></span></div></td></tr></tbody></table> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Helium_atom_QM.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/23/Helium_atom_QM.svg/300px-Helium_atom_QM.svg.png" decoding="async" width="300" height="301" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/23/Helium_atom_QM.svg/450px-Helium_atom_QM.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/23/Helium_atom_QM.svg/600px-Helium_atom_QM.svg.png 2x" data-file-width="665" data-file-height="667" /></a><figcaption>A drawing of the <a href="/wiki/Helium" title="Helium">helium</a> atom. In the nucleus, the protons are in red and neutrons are in purple</figcaption></figure> <p>The <b>nucleus</b> is the center of an <a href="/wiki/Atom" title="Atom">atom</a>. It is made up of <a href="/wiki/Nucleon" title="Nucleon">nucleons</a> called <a href="/wiki/Proton" title="Proton">protons</a> and <a href="/wiki/Neutrons" class="mw-redirect" title="Neutrons">neutrons</a> and is surrounded by the <a href="/wiki/Electron_cloud" title="Electron cloud">electron cloud</a>. The size (diameter) of the nucleus is between 1.6 <a href="/wiki/Femtometre" title="Femtometre">fm</a> (10<sup>−15</sup> m) (for a proton in light-weight <a href="/wiki/Hydrogen" title="Hydrogen">hydrogen</a>) to about 15 fm (for the heaviest atoms, such as <a href="/wiki/Uranium" title="Uranium">uranium</a>). These sizes are much smaller than the size of the atom itself by a factor of about 23,000 (uranium) to about 145,000 (hydrogen). Although it is only a very small part of the atom, the nucleus has most of the <a href="/wiki/Mass" title="Mass">mass</a>. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus. Only a small amount of mass is from the orbiting <a href="/wiki/Electron" title="Electron">electrons</a>. </p><p>Neutrons have no <a href="/wiki/Electric_charge" title="Electric charge">electric charge</a> and protons are positively charged. Because the nucleus is only made up of protons and neutrons it is positively charged. Things that have the same charge repel each other: this repulsion is part of what is called <a href="/wiki/Electromagnetic_force" class="mw-redirect" title="Electromagnetic force">electromagnetic force</a>. Unless there was something else holding the nucleus together it could not exist because the protons would push away from each other. The nucleus is actually held together by another force known as the <a href="/wiki/Strong_nuclear_force" class="mw-redirect" title="Strong nuclear force">strong nuclear force</a>. </p><p>The word <i>nucleus</i> is from 1704, meaning “kernel of a nut”. In 1844, <a href="/wiki/Michael_Faraday" title="Michael Faraday">Michael Faraday</a> used nucleus to describe the “central point of an atom”. The modern atomic meaning was proposed by <a href="/wiki/Ernest_Rutherford" title="Ernest Rutherford">Ernest Rutherford</a> in 1912.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The use of the word <i>nucleus</i> in atomic theory, however, did not happen immediately. In 1916, for example, <a href="/w/index.php?title=Gilbert_N._Lewis&action=edit&redlink=1" class="new" title="Gilbert N. Lewis (not yet started)">Gilbert N. Lewis</a> wrote in his famous article <i>The Atom and the Molecule</i> that "the atom is composed of the <i>kernel</i> and an outer atom or <i>shell</i>".<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Composition">Composition</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=1" title="Change section: Composition" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=1" title="Edit section's source code: Composition"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The nucleus of an atom is made up of protons and neutrons (two types of <a href="/wiki/Baryon" title="Baryon">baryons</a>) joined by the <a href="/wiki/Nuclear_force" title="Nuclear force">nuclear force</a>. These baryons are further made up of sub-atomic <a href="/wiki/Fundamental_particle" class="mw-redirect" title="Fundamental particle">fundamental particles</a> known as <a href="/wiki/Quarks" class="mw-redirect" title="Quarks">quarks</a> joined by the <a href="/wiki/Strong_interaction" title="Strong interaction">strong interaction</a>. The nucleus is more or less a <a href="/wiki/Spheroid" title="Spheroid">spheroid</a> and may be somewhat prolate (long) or oblate (flat) or otherwise not entirely round. </p><p>If the nucleus can be considered to have a radius of the order of 5 fm (= 10 × 10<sup>-15</sup> m), this means its <a href="/wiki/Cross_section_(geometry)" title="Cross section (geometry)">cross-section</a> is of the order of 10<sup>-28</sup> m<sup>2</sup>, and its volume is about 10<sup>-42</sup> m<sup>3</sup>. </p> <div class="mw-heading mw-heading3"><h3 id="Isotopes_and_nuclides">Isotopes and nuclides</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=2" title="Change section: Isotopes and nuclides" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=2" title="Edit section's source code: Isotopes and nuclides"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Isotope" title="Isotope">isotope</a> of an atom is based on the number of neutrons in the nucleus. Different isotopes of the same element have very similar <a href="/wiki/Chemistry" title="Chemistry">chemical</a> properties. Different isotopes in a sample of a chemical can be separated by using a <a href="/wiki/Centrifuge" title="Centrifuge">centrifuge</a> or by using a <a href="/wiki/Mass_spectrometer" class="mw-redirect" title="Mass spectrometer">mass spectrometer</a>. The first method is used in producing <a href="/w/index.php?title=Enriched_uranium&action=edit&redlink=1" class="new" title="Enriched uranium (not yet started)">enriched uranium</a> from regular uranium, and the second is used in <a href="/wiki/Carbon_dating" class="mw-redirect" title="Carbon dating">carbon dating</a>. </p><p>The number of protons and neutrons together determine the nuclide (type of nucleus). Protons and neutrons have nearly equal masses, and their combined number, the <a href="/wiki/Mass_number" title="Mass number">mass number</a>, is about equal to the <a href="/wiki/Atomic_mass" title="Atomic mass">atomic mass</a> of an atom. The combined mass of the electrons is very small when compared to the mass of the nucleus; protons and neutrons weigh about 2000 times more than electrons. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=3" title="Change section: History" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=3" title="Edit section's source code: History"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The discovery of the <a href="/wiki/Electron" title="Electron">electron</a> by <a href="/wiki/J._J._Thomson" title="J. J. Thomson">J. J. Thomson</a> was the first sign that the atom had internal structure. At the turn of the 20th century the accepted model of the atom was J. J. Thomson's <a href="/wiki/Plum_pudding_model" title="Plum pudding model">"plum pudding" model</a> in which the atom was a large positively charged ball with small negatively charged electrons embedded inside of it. By the turn of the century physicists had also discovered three types of <a href="/wiki/Radiation" title="Radiation">radiation</a> coming from atoms, which they named <a href="/wiki/Alpha_decay" class="mw-redirect" title="Alpha decay">alpha</a>, <a href="/wiki/Beta_decay" title="Beta decay">beta</a>, and <a href="/w/index.php?title=Gamma_decay&action=edit&redlink=1" class="new" title="Gamma decay (not yet started)">gamma</a> radiation. Experiments in <a href="/wiki/1911" title="1911">1911</a> by <a href="/wiki/Lise_Meitner" title="Lise Meitner">Lise Meitner</a> and <a href="/wiki/Otto_Hahn" title="Otto Hahn">Otto Hahn</a>, and by <a href="/wiki/James_Chadwick" title="James Chadwick">James Chadwick</a> in 1914 discovered that the beta decay <a href="/wiki/Spectrum" title="Spectrum">spectrum</a> was continuous rather than discrete. That is, electrons were ejected from the atom with a range of energies, rather than the discrete amounts of energies that were observed in gamma and <a href="/wiki/Alpha_decay" class="mw-redirect" title="Alpha decay">alpha decays</a>. This was a problem for nuclear physics at the time, because it indicated that <a href="/wiki/Conservation_of_energy" title="Conservation of energy">energy was not conserved</a> in these decays. The problem would later lead to the discovery of the neutrino (see below). </p><p>In 1906 <a href="/wiki/Ernest_Rutherford" title="Ernest Rutherford">Ernest Rutherford</a> published "Radiation of the α Particle from Radium in passing through Matter".<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Hans_Geiger" title="Hans Geiger">Geiger</a> expanded on this work in a communication to the Royal Society<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> with experiments he and Rutherford had done passing α particles through air, aluminum foil and gold foil. More work was published in 1909 by <a href="/wiki/Hans_Geiger" title="Hans Geiger">Geiger</a> and <a href="/w/index.php?title=Ernest_Marsden&action=edit&redlink=1" class="new" title="Ernest Marsden (not yet started)">Marsden</a><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> and further greatly expanded work was published in 1910 by <a href="/wiki/Hans_Geiger" title="Hans Geiger">Geiger</a>,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> In 1911-2 Rutherford went before the Royal Society to explain the experiments and propound the new theory of the atomic nucleus as we now understand it. </p><p>Around the same time that this was happening (<a href="/wiki/1909" title="1909">1909</a>) <a href="/wiki/Ernest_Rutherford" title="Ernest Rutherford">Ernest Rutherford</a> performed a remarkable <a href="/wiki/Geiger-Marsden_experiment" class="mw-redirect" title="Geiger-Marsden experiment">experiment</a> in which <a href="/wiki/Hans_Geiger" title="Hans Geiger">Hans Geiger</a> and <a href="/w/index.php?title=Ernest_Marsden&action=edit&redlink=1" class="new" title="Ernest Marsden (not yet started)">Ernest Marsden</a> under his supervision fired alpha particles (helium nuclei) at a thin film of <a href="/wiki/Gold" title="Gold">gold</a> foil. The plum pudding model predicted that the alpha particles should come out of the foil with their trajectories being at most slightly bent. He was shocked to discover that a few particles were scattered through large angles, even completely backwards in some cases. The discovery, beginning with Rutherford's analysis of the data in 1911, eventually led to the Rutherford model of the atom, in which the atom has a very small, very dense nucleus consisting of heavy positively charged particles with embedded electrons in order to balance out the charge. As an example, in this model nitrogen-14 consisted of a nucleus with 14 protons and 7 electrons, and the nucleus was surrounded by 7 more orbiting electrons. </p><p>The Rutherford model worked quite well until studies of <a href="/wiki/Spin_(physics)" title="Spin (physics)">nuclear spin</a> were carried out by <a href="/w/index.php?title=Franco_Rasetti&action=edit&redlink=1" class="new" title="Franco Rasetti (not yet started)">Franco Rasetti</a> at the <a href="/wiki/California_Institute_of_Technology" title="California Institute of Technology">California Institute of Technology</a> in <a href="/wiki/1929" title="1929">1929</a>. By <a href="/wiki/1925" title="1925">1925</a> it was known that protons and electrons had a spin of 1/2, and in the Rutherford model of nitrogen-14 the 14 protons and six of the electrons should have paired up to cancel each other's spin, and the final electron should have left the nucleus with a spin of 1/2. Rasetti discovered, however, that nitrogen-14 has a spin of one. </p><p>In <a href="/wiki/1930" title="1930">1930</a> <a href="/wiki/Wolfgang_Pauli" title="Wolfgang Pauli">Wolfgang Pauli</a> was unable to attend a meeting in <a href="/wiki/T%C3%BCbingen" title="Tübingen">Tübingen</a>, and instead sent a famous letter with the classic introduction "Dear Radioactive Ladies and Gentlemen". In his letter Pauli suggested that perhaps there was a third particle in the nucleus which he named the "neutron". He suggested that it was very light (lighter than an electron), had no charge, and that it did not readily interact with matter (which is why it had not yet been detected). This desperate way out solved both the problem of energy conservation and the spin of nitrogen-14, the first because Pauli's "neutron" was carrying away the extra energy and the second because an extra "neutron" paired off with the electron in the nitrogen-14 nucleus giving it spin one. Pauli's "neutron" was renamed the <a href="/wiki/Neutrino" title="Neutrino">neutrino</a> (Italian for little neutral one) by <a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Enrico Fermi</a> in <a href="/wiki/1931" title="1931">1931</a>, and after about thirty years it was finally demonstrated that a neutrino really is emitted during beta decay. </p><p>In <a href="/wiki/1932" title="1932">1932</a> Chadwick realized that radiation that had been observed by <a href="/w/index.php?title=Walther_Bothe&action=edit&redlink=1" class="new" title="Walther Bothe (not yet started)">Walther Bothe</a>, <a href="/w/index.php?title=Herbert_L._Becker&action=edit&redlink=1" class="new" title="Herbert L. Becker (not yet started)">Herbert L. Becker</a>, <a href="/wiki/Ir%C3%A8ne_Joliot-Curie" title="Irène Joliot-Curie">Irène</a> and <a href="/wiki/Fr%C3%A9d%C3%A9ric_Joliot-Curie" title="Frédéric Joliot-Curie">Frédéric Joliot-Curie</a> was actually due to a massive particle that he called the neutron. In the same year <a href="/w/index.php?title=Dmitri_Ivanenko&action=edit&redlink=1" class="new" title="Dmitri Ivanenko (not yet started)">Dmitri Ivanenko</a> suggested that neutrons were in fact spin 1/2 particles and that the nucleus contained neutrons and that there were no electrons in it, and <a href="/w/index.php?title=Francis_Perrin&action=edit&redlink=1" class="new" title="Francis Perrin (not yet started)">Francis Perrin</a> suggested that neutrinos were not nuclear particles but were created during beta decay. To cap the year off, Fermi submitted a theory of the neutrino to <i><a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a></i> (which the editors rejected for being "too remote from reality"). Fermi continued working on his theory and published a paper in <a href="/wiki/1934" title="1934">1934</a> which placed the neutrino on solid theoretical footing. In the same year <a href="/w/index.php?title=Hideki_Yukawa&action=edit&redlink=1" class="new" title="Hideki Yukawa (not yet started)">Hideki Yukawa</a> proposed the first significant theory of the strong force to explain how the nucleus holds together. </p><p>With Fermi and Yukawa's papers the modern model of the atom was complete. The center of the atom contains a tight ball of neutrons and protons, which is held together by the strong nuclear force. Unstable nuclei may undergo alpha decay, in which they emit an energetic helium nucleus, or beta decay, in which they eject an electron (or <a href="/wiki/Positron" title="Positron">positron</a>). After one of these decays the resultant nucleus may be left in an excited state, and in this case it decays to its ground state by emitting high energy photons (gamma decay). </p><p>The study of the strong and weak nuclear forces led physicists to collide nuclei and electrons at ever higher energies. This research became the science of <a href="/wiki/Particle_physics" title="Particle physics">particle physics</a>, the most important of which is the <a href="/wiki/Standard_Model" title="Standard Model">standard model of particle physics</a> which unifies the strong, weak, and electromagnetic forces. </p> <div class="mw-heading mw-heading2"><h2 id="Modern_nuclear_physics">Modern nuclear physics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=4" title="Change section: Modern nuclear physics" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=4" title="Edit section's source code: Modern nuclear physics"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A nucleus can contain hundreds of <a href="/wiki/Nucleon" title="Nucleon">nucleons</a> which means that with some approximation it can be treated as a <a href="/wiki/Newtonian_mechanics" class="mw-redirect" title="Newtonian mechanics">classical system</a>, rather than a <a href="/wiki/Quantum_mechanics" title="Quantum mechanics">quantum-mechanical</a> one. In the resulting <a href="/w/index.php?title=Liquid-drop_model&action=edit&redlink=1" class="new" title="Liquid-drop model (not yet started)">liquid-drop model</a>, the nucleus has an energy which arises partly from <a href="/wiki/Surface_tension" title="Surface tension">surface tension</a> and partly from electrical repulsion of the protons. The liquid-drop model is able to reproduce many features of nuclei, including the general trend of <a href="/w/index.php?title=Binding_energy&action=edit&redlink=1" class="new" title="Binding energy (not yet started)">binding energy</a> with respect to <a href="/wiki/Mass_number" title="Mass number">mass number</a>, as well as the phenomenon of <a href="/wiki/Nuclear_fission" title="Nuclear fission">nuclear fission</a>. </p><p>Superimposed on this classical picture, however, are quantum-mechanical effects, which can be described using the nuclear <a href="/w/index.php?title=Shell_model&action=edit&redlink=1" class="new" title="Shell model (not yet started)">shell model</a>, developed in large part by <a href="/wiki/Maria_Goeppert-Mayer" class="mw-redirect" title="Maria Goeppert-Mayer">Maria Goeppert-Mayer</a>. Nuclei with certain numbers of neutrons and protons (the magic numbers 2, 8, 20, 50, 82, 126, ...) are particularly stable, because their shells are filled. </p><p>Much of current research in <a href="/wiki/Nuclear_physics" title="Nuclear physics">nuclear physics</a> relates to the study of nuclei under extreme conditions such as high <a href="/wiki/Spin_(physics)" title="Spin (physics)">spin</a> and excitation energy. Nuclei may also have extreme shapes (similar to that of <a href="/wiki/American_football" title="American football">American footballs</a>) or extreme neutron-to-proton ratios. Experimenters can create such nuclei using artificially induced fusion or nucleon transfer reactions, employing ion beams from an <a href="/wiki/Particle_accelerator" title="Particle accelerator">accelerator</a>. Beams with even higher energies can be used to create nuclei at very high temperatures, and there are signs that these experiments have produced a <a href="/wiki/Phase_transition" class="mw-redirect" title="Phase transition">phase transition</a> from normal nuclear matter to a new state, the quark-gluon plasma, in which the <a href="/wiki/Quark" title="Quark">quarks</a> mingle with one another, rather than being segregated in triplets as they are in neutrons and protons. </p> <div class="mw-heading mw-heading2"><h2 id="Topics_in_nuclear_physics">Topics in nuclear physics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=5" title="Change section: Topics in nuclear physics" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=5" title="Edit section's source code: Topics in nuclear physics"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Nuclear_decay">Nuclear decay</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=6" title="Change section: Nuclear decay" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=6" title="Edit section's source code: Nuclear decay"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r9671799">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See the main article: <a href="/wiki/Radioactive_decay" title="Radioactive decay">Radioactive decay</a></div> <p>If a nucleus has too few or too many neutrons it may be unstable, and will decay after some period of time. For example, <a href="/wiki/Nitrogen" title="Nitrogen">nitrogen</a>-16 atoms (7 protons, 9 neutrons) <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a> to <a href="/wiki/Oxygen" title="Oxygen">oxygen</a>-16 atoms (8 protons, 8 neutrons) within a few seconds of being created. In this decay a neutron in the nitrogen nucleus is turned into a proton and an electron by the <a href="/wiki/Weak_nuclear_force" class="mw-redirect" title="Weak nuclear force">weak nuclear force</a>. The element of the atom changes because while it previously had seven protons (which makes it nitrogen) it now has eight (which makes it oxygen). Many elements have multiple isotopes which are stable for weeks, years, or even billions of years. </p> <div class="mw-heading mw-heading3"><h3 id="Nuclear_fusion">Nuclear fusion</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=7" title="Change section: Nuclear fusion" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=7" title="Edit section's source code: Nuclear fusion"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9671799"><div role="note" class="hatnote navigation-not-searchable">See the main article: <a href="/wiki/Nuclear_fusion" title="Nuclear fusion">Nuclear fusion</a></div> <p>When two light nuclei come into very close contact with each other it is possible for the strong force to <a href="/wiki/Nuclear_fusion" title="Nuclear fusion">fuse</a> the two together. It takes a great deal of energy to push the nuclei close enough together for the strong force to have an effect, so the process of nuclear fusion can only take place at very high temperatures or high densities. Once the nuclei are close enough together the strong force overcomes their electromagnetic repulsion and squishes them into a new nucleus. A very large amount of energy is released when light nuclei fuse together because the <a href="/w/index.php?title=Binding_energy&action=edit&redlink=1" class="new" title="Binding energy (not yet started)">binding energy</a> per nucleon increases with <a href="/wiki/Mass_number" title="Mass number">mass number</a> up until <a href="/wiki/Nickel" title="Nickel">nickel</a>-62. <a href="/wiki/Star" title="Star">Stars</a> like our sun are powered by the fusion of four protons into a helium nucleus, two <a href="/wiki/Positrons" class="mw-redirect" title="Positrons">positrons</a>, and two <a href="/wiki/Neutrinos" class="mw-redirect" title="Neutrinos">neutrinos</a>. The <i>uncontrolled</i> fusion of hydrogen into helium is known as <a href="/w/index.php?title=Thermonuclear_runaway&action=edit&redlink=1" class="new" title="Thermonuclear runaway (not yet started)">thermonuclear runaway</a>. Research to find an economically viable method of using energy from a <i>controlled</i> fusion reaction is currently being undertaken by various research establishments (see <a href="/wiki/Joint_European_Torus" title="Joint European Torus">JET</a> and <a href="/w/index.php?title=ITER&action=edit&redlink=1" class="new" title="ITER (not yet started)">ITER</a>). </p> <div class="mw-heading mw-heading3"><h3 id="Nuclear_fission">Nuclear fission</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=8" title="Change section: Nuclear fission" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=8" title="Edit section's source code: Nuclear fission"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r9671799"><div role="note" class="hatnote navigation-not-searchable">See the main article: <a href="/wiki/Nuclear_fission" title="Nuclear fission">Nuclear fission</a></div> <p>For nuclei heavier than <a href="/wiki/Nickel" title="Nickel">nickel</a>-62 the <a href="/w/index.php?title=Binding_energy&action=edit&redlink=1" class="new" title="Binding energy (not yet started)">binding energy</a> per nucleon decreases with the <a href="/wiki/Mass_number" title="Mass number">mass number</a>. It is therefore possible for energy to be released if a heavy nucleus breaks apart into two lighter ones. This splitting of atoms is known as nuclear fission. </p><p>The process of <a href="/wiki/Alpha_decay" class="mw-redirect" title="Alpha decay">alpha decay</a> may be thought of as a special type of spontaneous <a href="/wiki/Nuclear_fission" title="Nuclear fission">nuclear fission</a>. This process produces a highly asymmetrical fission because the four particles which make up the alpha particle are especially tightly bound to each other, making production of this nucleus in fission particularly likely. </p><p>For certain of the heaviest nuclei which produce neutrons on fission, and which also easily absorb neutrons to initiate fission, a self-igniting type of neutron-initiated fission can be obtained, in a so-called <a href="/w/index.php?title=Chain_reaction&action=edit&redlink=1" class="new" title="Chain reaction (not yet started)">chain reaction</a>. [Chain reactions were known in <a href="/wiki/Chemistry" title="Chemistry">chemistry</a> before <a href="/wiki/Physics" title="Physics">physics</a>, and in fact many familiar processes like fires and chemical explosions are chemical chain reactions]. The fission or "nuclear" chain-reaction, using fission-produced neutrons, is the source of energy for <a href="/wiki/Nuclear_power" title="Nuclear power">nuclear power</a> plants and fission type nuclear bombs such as the two that the <a href="/wiki/United_States" title="United States">United States</a> used against <a href="/wiki/Hiroshima" title="Hiroshima">Hiroshima</a> and <a href="/wiki/Nagasaki,_Nagasaki" class="mw-redirect" title="Nagasaki, Nagasaki">Nagasaki</a> at the end of <a href="/wiki/World_War_II" title="World War II">World War II</a>. Heavy nuclei such as <a href="/wiki/Uranium" title="Uranium">uranium</a> and <a href="/wiki/Thorium" title="Thorium">thorium</a> may undergo <a href="/w/index.php?title=Spontaneous_fission&action=edit&redlink=1" class="new" title="Spontaneous fission (not yet started)">spontaneous fission</a>, but they are much more likely to undergo decay by alpha decay. </p><p>For a neutron-initiated chain-reaction to occur, there must be a <a href="/w/index.php?title=Critical_mass&action=edit&redlink=1" class="new" title="Critical mass (not yet started)">critical mass</a> of the element present in a certain space under certain conditions (these conditions slow and conserve neutrons for the reactions). There is one known example of a <a href="/w/index.php?title=Natural_nuclear_fission_reactor&action=edit&redlink=1" class="new" title="Natural nuclear fission reactor (not yet started)">natural nuclear fission reactor</a>, which was active in two regions of <a href="/w/index.php?title=Oklo&action=edit&redlink=1" class="new" title="Oklo (not yet started)">Oklo</a>, Gabon, Africa, over 1.5 billion years ago. Measurements of natural neutrino emission have demonstrated that around half of the heat emanating from the earth's core results from radioactive decay. However, it is not known if any of this results from fission chain-reactions. </p> <div class="mw-heading mw-heading3"><h3 id="Production_of_heavy_elements">Production of heavy elements</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=9" title="Change section: Production of heavy elements" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=9" title="Edit section's source code: Production of heavy elements"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As the Universe cooled after the <a href="/wiki/Big_bang" class="mw-redirect" title="Big bang">big bang</a> it eventually became possible for particles as we know them to exist. The most common particles created in the big bang which are still easily observable to us today were protons (<a href="/wiki/Hydrogen" title="Hydrogen">hydrogen</a>) and electrons (in equal numbers). Some heavier elements were created as the protons collided with each other, but most of the heavy elements we see today were created inside of stars during a series of fusion stages, such as the <a href="/w/index.php?title=Proton-proton_chain&action=edit&redlink=1" class="new" title="Proton-proton chain (not yet started)">proton-proton chain</a>, the <a href="/w/index.php?title=CNO_cycle&action=edit&redlink=1" class="new" title="CNO cycle (not yet started)">CNO cycle</a> and the <a href="/w/index.php?title=Triple-alpha_process&action=edit&redlink=1" class="new" title="Triple-alpha process (not yet started)">triple-alpha process</a>. Progressively heavier elements are made during the <a href="/wiki/Stellar_evolution" title="Stellar evolution">evolution</a> of a star. </p><p>Since the binding energy per nucleon peaks around iron, energy is only released in fusion processes occurring below this point. Since the creation of heavier nuclei by fusion costs energy, nature resorts to the process of neutron capture. Neutrons (due to their lack of charge) are readily absorbed by a nucleus. The heavy elements are created by either a slow neutron capture process (the so-called <i>s</i> process) or by the rapid, or <i>r</i> process. The <i>s</i> process occurs in thermally pulsing stars (called AGB, or asymptotic giant branch stars) and takes hundreds to thousands of years to reach the heaviest elements of lead and bismuth. The <i>r</i> process is thought to occur in <a href="/wiki/Supernova" title="Supernova">supernova</a> explosions because the conditions of high temperature, high neutron flux and ejected matter are present. These stellar conditions make the successive neutron captures very fast, involving very neutron-rich species which then beta-decay to heavier elements, especially at the so-called waiting points that correspond to more stable nuclides with closed neutron shells (<a href="/w/index.php?title=Magic_number_(physics)&action=edit&redlink=1" class="new" title="Magic number (physics) (not yet started)">magic numbers</a>). The <i>r</i> process duration is typically in the range of a few seconds. </p> <div class="mw-heading mw-heading2"><h2 id="Related_pages">Related pages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=10" title="Change section: Related pages" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=10" title="Edit section's source code: Related pages"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <div style="-moz-column-count:3; column-count:3;"> <ul><li><a href="/wiki/Radioactivity" class="mw-redirect" title="Radioactivity">Radioactivity</a></li> <li><a href="/wiki/Nuclear_fusion" title="Nuclear fusion">Nuclear fusion</a></li> <li><a href="/wiki/Nuclear_fission" title="Nuclear fission">Nuclear fission</a></li> <li><a href="/w/index.php?title=Nuclear_medicine&action=edit&redlink=1" class="new" title="Nuclear medicine (not yet started)">Nuclear medicine</a></li> <li><a href="/wiki/Nuclear_physics" title="Nuclear physics">Nuclear physics</a></li> <li><a href="/wiki/Atomic_number" title="Atomic number">Atomic number</a></li> <li><a href="/wiki/Atomic_mass" title="Atomic mass">Atomic mass</a></li> <li><a href="/wiki/Isotope" title="Isotope">Isotope</a></li> <li><a href="/w/index.php?title=Liquid_drop_model&action=edit&redlink=1" class="new" title="Liquid drop model (not yet started)">Liquid drop model</a></li></ul> </div> <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=Atomic_nucleus&veaction=edit&section=11" title="Change section: References" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=11" title="Edit section's source code: References"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.etymonline.com/index.php?search=Nucleus&searchmode=none">Nucleus – Online Etymology Dictionary</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text">Gilbert N. Lewis <a rel="nofollow" class="external text" href="http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Lewis-1916/Lewis-1916.html"><i>The Atom and the Molecule</i></a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070918004659/http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Lewis-1916/Lewis-1916.html">Archived</a> 2007-09-18 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><i>Philosophical Magazine</i> (<b>12</b>, p 134-46)</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><i>Proc. Roy. Soc.</i> July 17, 1908</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><i>Proc. Roy. Soc.</i> <b>A82</b> p 495-500</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><i>Proc. Roy. Soc.</i> Feb. 1, 1910</span> </li> </ol> <div class="mw-heading mw-heading2"><h2 id="Other_websites">Other websites</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Atomic_nucleus&veaction=edit&section=12" title="Change section: Other websites" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Atomic_nucleus&action=edit&section=12" title="Edit section's source code: Other websites"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.lightandmatter.com/html_books/4em/ch02/ch02.html">The Nucleus - a chapter from an online textbook</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20101214111339/http://www.lightandmatter.com/html_books/4em/ch02/ch02.html">Archived</a> 2010-12-14 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://kolessintheories.com/">- Study of the NUCLEAR STRUCTURE by R. Kolessin</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link since January 2021">permanent dead link</span></a></i>]</span></sup></li></ul> <div class="navbox-styles nomobile"><style data-mw-deduplicate="TemplateStyles:r9122492">.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 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title="Fermion">Fermions</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal;"><a href="/wiki/Quark" title="Quark">Quarks</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Up_quark" title="Up quark">Up (quark</a></li> <li><a href="/wiki/Up_antiquark" title="Up antiquark">antiquark)</a></li> <li><a href="/wiki/Down_quark" title="Down quark">Down (quark</a></li> <li><a href="/w/index.php?title=Down_antiquark&action=edit&redlink=1" class="new" title="Down antiquark (not yet started)">antiquark)</a></li> <li><a href="/wiki/Charm_quark" title="Charm quark">Charm (quark</a></li> <li><a href="/w/index.php?title=Charm_antiquark&action=edit&redlink=1" class="new" title="Charm antiquark (not yet started)">antiquark)</a></li> <li><a href="/wiki/Strange_quark" title="Strange quark">Strange (quark</a></li> <li><a href="/w/index.php?title=Strange_antiquark&action=edit&redlink=1" class="new" title="Strange antiquark (not yet started)">antiquark)</a></li> <li><a href="/wiki/Top_quark" title="Top quark">Top (quark</a></li> <li><a href="/w/index.php?title=Top_antiquark&action=edit&redlink=1" class="new" title="Top antiquark (not yet started)">antiquark)</a></li> <li><a href="/wiki/Bottom_quark" title="Bottom quark">Bottom (quark</a></li> <li><a href="/w/index.php?title=Bottom_antiquark&action=edit&redlink=1" class="new" title="Bottom antiquark (not yet started)">antiquark)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal;"><a href="/wiki/Lepton" title="Lepton">Leptons</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Electron" title="Electron">Electron</a></li> <li><a href="/wiki/Positron" title="Positron">Positron</a></li> <li><a href="/wiki/Muon" title="Muon">Muon</a></li> <li><a href="/wiki/Muon" title="Muon">Antimuon</a></li> <li><a href="/wiki/Tau_(particle)" class="mw-redirect" title="Tau (particle)">Tau</a></li> <li><a href="/wiki/Tau_(particle)" class="mw-redirect" title="Tau (particle)">Antitau</a></li> <li><a href="/wiki/Electron_neutrino" title="Electron neutrino">Electron neutrino</a></li> <li><a href="/wiki/Neutrino#Antineutrinos" title="Neutrino">Electron antineutrino</a></li> <li><a href="/w/index.php?title=Muon_neutrino&action=edit&redlink=1" class="new" title="Muon neutrino (not yet started)">Muon neutrino</a></li> <li><a href="/wiki/Neutrino#Antineutrinos" title="Neutrino">Muon antineutrino</a></li> <li><a href="/wiki/Tau_neutrino" title="Tau neutrino">Tau neutrino</a></li> <li><a href="/wiki/Neutrino#Antineutrinos" title="Neutrino">Tau antineutrino</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="/wiki/Boson" title="Boson">Bosons</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:4em;font-weight:normal; text-align: center;"><a href="/wiki/Gauge_boson" title="Gauge boson">Gauge</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Photon" title="Photon">Photon</a></li> <li><a href="/wiki/Gluon" title="Gluon">Gluon</a></li> <li><a href="/wiki/W_and_Z_bosons" title="W and Z bosons">W and Z bosons</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:4em;font-weight:normal; text-align: center;"><a href="/wiki/Scalar_boson" title="Scalar boson">Scalar</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Higgs_boson" title="Higgs boson">Higgs boson </a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;;font-weight:normal; text-align: center;"><a href="/w/index.php?title=Ghost_(physics)&action=edit&redlink=1" class="new" title="Ghost (physics) (not yet started)">Ghost fields</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Faddeev%E2%80%93Popov_ghost&action=edit&redlink=1" class="new" title="Faddeev–Popov ghost (not yet started)">Faddeev–Popov ghosts</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="/wiki/Hypothetical_particles" class="mw-redirect" title="Hypothetical particles">Hypothetical</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="/w/index.php?title=Superpartner&action=edit&redlink=1" class="new" title="Superpartner (not yet started)">Superpartners</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="/w/index.php?title=Gaugino&action=edit&redlink=1" class="new" title="Gaugino (not yet started)">Gauginos</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Gluino&action=edit&redlink=1" class="new" title="Gluino (not yet started)">Gluino</a></li> <li><a href="/wiki/Gravitino" title="Gravitino">Gravitino</a></li> <li><a href="/wiki/Photino" title="Photino">Photino</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Axino&action=edit&redlink=1" class="new" title="Axino (not yet started)">Axino</a></li> <li><a href="/w/index.php?title=Chargino&action=edit&redlink=1" class="new" title="Chargino (not yet started)">Chargino</a></li> <li><a href="/w/index.php?title=Higgsino&action=edit&redlink=1" class="new" title="Higgsino (not yet started)">Higgsino</a></li> <li><a href="/w/index.php?title=Neutralino&action=edit&redlink=1" class="new" title="Neutralino (not yet started)">Neutralino</a></li> <li><a href="/w/index.php?title=Sfermion&action=edit&redlink=1" class="new" title="Sfermion (not yet started)">Sfermion</a> (<a href="/w/index.php?title=Stop_squark&action=edit&redlink=1" class="new" title="Stop squark (not yet started)">Stop squark</a>)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">Others</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Axion" title="Axion">Axion</a></li> <li><a href="/w/index.php?title=Curvaton&action=edit&redlink=1" class="new" title="Curvaton (not yet started)">Curvaton</a></li> <li><a href="/w/index.php?title=Dilaton&action=edit&redlink=1" class="new" title="Dilaton (not yet started)">Dilaton</a></li> <li><a href="/w/index.php?title=Dual_graviton&action=edit&redlink=1" class="new" title="Dual graviton (not yet started)">Dual graviton</a></li> <li><a href="/w/index.php?title=Graviphoton&action=edit&redlink=1" class="new" title="Graviphoton (not yet started)">Graviphoton</a></li> <li><a href="/wiki/Graviton" title="Graviton">Graviton</a></li> <li><a href="/w/index.php?title=Inflaton&action=edit&redlink=1" class="new" title="Inflaton (not yet started)">Inflaton</a></li> <li><a href="/w/index.php?title=Leptoquark&action=edit&redlink=1" class="new" title="Leptoquark (not yet started)">Leptoquark</a></li> <li><a href="/wiki/Magnetic_monopole" title="Magnetic monopole">Magnetic monopole</a></li> <li><a href="/w/index.php?title=Majoron&action=edit&redlink=1" class="new" title="Majoron (not yet started)">Majoron</a></li> <li><a href="/wiki/Majorana_fermion" title="Majorana fermion">Majorana fermion</a></li> <li><a href="/w/index.php?title=Dark_photon&action=edit&redlink=1" class="new" title="Dark photon (not yet started)">Dark photon</a></li> <li><a href="/w/index.php?title=Preon&action=edit&redlink=1" class="new" title="Preon (not yet started)">Preon</a></li> <li><a href="/wiki/Sterile_neutrino" title="Sterile neutrino">Sterile neutrino</a></li> <li><a href="/wiki/Tachyon" title="Tachyon">Tachyon</a></li> <li><a href="/w/index.php?title=W%E2%80%B2_and_Z%E2%80%B2_bosons&action=edit&redlink=1" class="new" title="W′ and Z′ bosons (not yet started)">W′ and Z′ bosons</a></li> <li><a href="/w/index.php?title=X_and_Y_bosons&action=edit&redlink=1" class="new" title="X and Y bosons (not yet started)">X and Y bosons</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/w/index.php?title=Bound_state&action=edit&redlink=1" class="new" title="Bound state (not yet started)">Composite</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Hadrons" scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="/wiki/Hadron" title="Hadron">Hadrons</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="/wiki/Baryon" title="Baryon">Baryons</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Nucleon" title="Nucleon">Nucleon</a> <ul><li><a href="/wiki/Proton" title="Proton">Proton</a></li> <li><a href="/wiki/Antiproton" title="Antiproton">Antiproton</a></li> <li><a href="/wiki/Neutron" title="Neutron">Neutron</a></li> <li><a href="/wiki/Antineutron" title="Antineutron">Antineutron</a></li></ul></li> <li><a href="/w/index.php?title=Delta_baryon&action=edit&redlink=1" class="new" title="Delta baryon (not yet started)">Delta baryon</a></li> <li><a href="/w/index.php?title=Lambda_baryon&action=edit&redlink=1" class="new" title="Lambda baryon (not yet started)">Lambda baryon</a></li> <li><a href="/w/index.php?title=Sigma_baryon&action=edit&redlink=1" class="new" title="Sigma baryon (not yet started)">Sigma baryon</a></li> <li><a href="/w/index.php?title=Xi_baryon&action=edit&redlink=1" class="new" title="Xi baryon (not yet started)">Xi baryon</a></li> <li><a href="/w/index.php?title=Omega_baryon&action=edit&redlink=1" class="new" title="Omega baryon (not yet started)">Omega baryon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="/wiki/Meson" title="Meson">Mesons</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pion" title="Pion">Pion</a></li> <li><a href="/w/index.php?title=Rho_meson&action=edit&redlink=1" class="new" title="Rho meson (not yet started)">Rho meson</a></li> <li><a href="/w/index.php?title=Eta_meson&action=edit&redlink=1" class="new" title="Eta meson (not yet started)">Eta and eta prime mesons</a></li> <li><a href="/w/index.php?title=Bottom_eta_meson&action=edit&redlink=1" class="new" title="Bottom eta meson (not yet started)">Bottom eta meson</a></li> <li><a href="/w/index.php?title=Phi_meson&action=edit&redlink=1" class="new" title="Phi meson (not yet started)">Phi meson</a></li> <li><a href="/w/index.php?title=J/psi_meson&action=edit&redlink=1" class="new" title="J/psi meson (not yet started)">J/psi meson</a></li> <li><a href="/w/index.php?title=Omega_meson&action=edit&redlink=1" class="new" title="Omega meson (not yet started)">Omega meson</a></li> <li><a href="/w/index.php?title=Upsilon_meson&action=edit&redlink=1" class="new" title="Upsilon meson (not yet started)">Upsilon meson</a></li> <li><a href="/wiki/Kaon" title="Kaon">Kaon</a></li> <li><a href="/w/index.php?title=B_meson&action=edit&redlink=1" class="new" title="B meson (not yet started)">B meson</a></li> <li><a href="/w/index.php?title=D_meson&action=edit&redlink=1" class="new" title="D meson (not yet started)">D meson</a></li> <li><a href="/wiki/Quarkonium" title="Quarkonium">Quarkonium</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="/w/index.php?title=Exotic_hadron&action=edit&redlink=1" class="new" title="Exotic hadron (not yet started)">Exotic hadrons</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Tetraquark&action=edit&redlink=1" class="new" title="Tetraquark (not yet started)">Tetraquark</a> (<a href="/w/index.php?title=Double-charm_tetraquark&action=edit&redlink=1" class="new" title="Double-charm tetraquark (not yet started)">Double-charm tetraquark</a>)</li> <li><a href="/w/index.php?title=Pentaquark&action=edit&redlink=1" class="new" title="Pentaquark (not yet started)">Pentaquark</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;;font-weight:normal; text-align: center;">Others</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Atomic nuclei</a></li> <li><a href="/wiki/Atom" title="Atom">Atoms</a></li> <li><a href="/wiki/Exotic_atom" title="Exotic atom">Exotic atoms</a> <ul><li><a href="/wiki/Positronium" title="Positronium">Positronium</a></li> <li><a href="/w/index.php?title=Muonium&action=edit&redlink=1" class="new" title="Muonium (not yet started)">Muonium</a></li> <li><a href="/w/index.php?title=Tauonium&action=edit&redlink=1" class="new" title="Tauonium (not yet started)">Tauonium</a></li> <li><a href="/w/index.php?title=Onium&action=edit&redlink=1" class="new" title="Onium (not yet started)">Onia</a></li> <li><a href="/w/index.php?title=Pionium&action=edit&redlink=1" class="new" title="Pionium (not yet started)">Pionium</a></li> <li><a href="/w/index.php?title=Protonium&action=edit&redlink=1" class="new" title="Protonium (not yet started)">Protonium</a></li></ul></li> <li><a href="/wiki/Superatom" title="Superatom">Superatoms</a></li> <li><a href="/wiki/Molecule" title="Molecule">Molecules</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="/w/index.php?title=Category:Hypothetical_composite_particles&action=edit&redlink=1" class="new" title="Category:Hypothetical composite particles (not yet started)">Hypothetical</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal;">Baryons</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Hexaquark&action=edit&redlink=1" class="new" title="Hexaquark (not yet started)">Hexaquark</a></li> <li><a href="/w/index.php?title=Heptaquark&action=edit&redlink=1" class="new" title="Heptaquark (not yet started)">Heptaquark</a></li> <li><a href="/wiki/Skyrmion" title="Skyrmion">Skyrmion</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal;">Mesons</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Glueball&action=edit&redlink=1" class="new" title="Glueball (not yet started)">Glueball</a></li> <li><a href="/w/index.php?title=Theta_meson&action=edit&redlink=1" class="new" title="Theta meson (not yet started)">Theta meson</a></li> <li><a href="/w/index.php?title=T_meson&action=edit&redlink=1" class="new" title="T meson (not yet started)">T meson</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;;font-weight:normal; text-align: center;">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Mesonic_molecule&action=edit&redlink=1" class="new" title="Mesonic molecule (not yet started)">Mesonic molecule</a></li> <li><a href="/w/index.php?title=Pomeron&action=edit&redlink=1" class="new" title="Pomeron (not yet started)">Pomeron</a></li> <li><a href="/w/index.php?title=Diquark&action=edit&redlink=1" class="new" title="Diquark (not yet started)">Diquark</a></li> <li><a href="/w/index.php?title=R-hadron&action=edit&redlink=1" class="new" title="R-hadron (not yet started)">R-hadron</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Quasiparticle" title="Quasiparticle">Quasiparticles</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Anyon&action=edit&redlink=1" class="new" title="Anyon (not yet started)">Anyon</a></li> <li><a href="/w/index.php?title=Davydov_soliton&action=edit&redlink=1" class="new" title="Davydov soliton (not yet started)">Davydov soliton</a></li> <li><a href="/w/index.php?title=Dropleton&action=edit&redlink=1" class="new" title="Dropleton (not yet started)">Dropleton</a></li> <li><a href="/wiki/Exciton" title="Exciton">Exciton</a></li> <li><a href="/w/index.php?title=Fracton_(subdimensional_particle)&action=edit&redlink=1" class="new" title="Fracton (subdimensional particle) (not yet started)">Fracton</a></li> <li><a href="/wiki/Electron_hole" title="Electron hole">Hole</a></li> <li><a href="/wiki/Magnon" title="Magnon">Magnon</a></li> <li><a href="/wiki/Phonon" title="Phonon">Phonon</a></li> <li><a href="/w/index.php?title=Plasmaron&action=edit&redlink=1" class="new" title="Plasmaron (not yet started)">Plasmaron</a></li> <li><a href="/w/index.php?title=Plasmon&action=edit&redlink=1" class="new" title="Plasmon (not yet started)">Plasmon</a></li> <li><a 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