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Available in 74 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-74" 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">74 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/Alfadeeltjie" title="Alfadeeltjie – Afrikaans" lang="af" hreflang="af" data-title="Alfadeeltjie" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AC%D8%B3%D9%8A%D9%85_%D8%A3%D9%84%D9%81%D8%A7" title="جسيم ألفا – Arabic" lang="ar" hreflang="ar" data-title="جسيم ألفا" 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/Part%C3%ADcula_alfa" title="Partícula alfa – Asturian" lang="ast" hreflang="ast" data-title="Partícula alfa" 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/Alfa_hiss%C9%99ciyi" title="Alfa hissəciyi – Azerbaijani" lang="az" hreflang="az" data-title="Alfa hissəciyi" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%86%E0%A6%B2%E0%A6%AB%E0%A6%BE_%E0%A6%95%E0%A6%A3%E0%A6%BE" title="আলফা কণা – Bangla" lang="bn" hreflang="bn" data-title="আলফা কণা" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%90%D0%BB%D1%8C%D1%84%D0%B0-%D1%87%D0%B0%D1%81%D1%86%D1%96%D1%86%D0%B0" title="Альфа-часціца – Belarusian" lang="be" hreflang="be" data-title="Альфа-часціца" 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%D0%BB%D1%8C%D1%84%D0%B0-%D1%87%D0%B0%D1%81%D1%8C%D1%86%D1%96%D0%BD%D0%BA%D0%B0" title="Альфа-часьцінка – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Альфа-часьцінка" 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-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%90%D0%BB%D1%84%D0%B0-%D1%87%D0%B0%D1%81%D1%82%D0%B8%D1%86%D0%B0" title="Алфа-частица – Bulgarian" lang="bg" hreflang="bg" data-title="Алфа-частица" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%A8%E0%BD%A3%E0%BC%8B%E0%BD%95%E0%BC%8B%E0%BD%A2%E0%BE%A1%E0%BD%B4%E0%BD%A3%E0%BC%8D" title="ཨལ་ཕ་རྡུལ། – Tibetan" lang="bo" hreflang="bo" data-title="ཨལ་ཕ་རྡུལ།" data-language-autonym="བོད་ཡིག" data-language-local-name="Tibetan" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Alfa_%C4%8Destica" title="Alfa čestica – Bosnian" lang="bs" hreflang="bs" data-title="Alfa čestica" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Part%C3%ADcula_%CE%B1" title="Partícula α – Catalan" lang="ca" hreflang="ca" data-title="Partícula α" 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%90%D0%BB%D1%8C%D1%84%D0%B0-%D0%BF%C4%95%D1%80%D1%87%C4%95" title="Альфа-пĕрчĕ – Chuvash" lang="cv" hreflang="cv" data-title="Альфа-пĕрчĕ" 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/%C4%8C%C3%A1stice_alfa" title="Částice alfa – Czech" lang="cs" hreflang="cs" data-title="Částice alfa" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da badge-Q70894304 mw-list-item" title=""><a href="https://da.wikipedia.org/wiki/Alfapartikel" title="Alfapartikel – Danish" lang="da" hreflang="da" data-title="Alfapartikel" 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%81%D8%B1%D8%AA%D9%8A%D8%AA%D8%A9_%D8%A3%D9%84%D9%81%D8%A7" title="فرتيتة ألفا – Moroccan Arabic" lang="ary" hreflang="ary" data-title="فرتيتة ألفا" 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 badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/Alphateilchen" title="Alphateilchen – German" lang="de" hreflang="de" data-title="Alphateilchen" 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/Alfaosake" title="Alfaosake – Estonian" lang="et" hreflang="et" data-title="Alfaosake" 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%A3%CF%89%CE%BC%CE%B1%CF%84%CE%AF%CE%B4%CE%B9%CE%BF_%CE%AC%CE%BB%CF%86%CE%B1" title="Σωματίδιο άλφα – Greek" lang="el" hreflang="el" data-title="Σωματίδιο άλφα" 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/Alpha_particle" title="Alpha particle – English" lang="en" hreflang="en" data-title="Alpha particle" 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/Part%C3%ADcula_alfa" title="Partícula alfa – Spanish" lang="es" hreflang="es" data-title="Partícula alfa" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo badge-Q70893996 mw-list-item" title=""><a href="https://eo.wikipedia.org/wiki/Alfa-partiklo" title="Alfa-partiklo – Esperanto" lang="eo" hreflang="eo" data-title="Alfa-partiklo" 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/Alfa_partikula" title="Alfa partikula – Basque" lang="eu" hreflang="eu" data-title="Alfa partikula" 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/%D8%B0%D8%B1%D8%A7%D8%AA_%D8%A2%D9%84%D9%81%D8%A7" title="ذرات آلفا – Persian" lang="fa" hreflang="fa" data-title="ذرات آلفا" 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/Particule_%CE%B1" title="Particule α – French" lang="fr" hreflang="fr" data-title="Particule α" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Alfa-ch%C3%A1ithn%C3%ADn" title="Alfa-cháithnín – Irish" lang="ga" hreflang="ga" data-title="Alfa-cháithnín" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Part%C3%ADcula_alfa" title="Partícula alfa – Galician" lang="gl" hreflang="gl" data-title="Partícula alfa" 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%95%8C%ED%8C%8C_%EC%9E%85%EC%9E%90" title="알파 입자 – Korean" lang="ko" hreflang="ko" data-title="알파 입자" 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/%D4%B1%D5%AC%D6%86%D5%A1-%D5%B4%D5%A1%D5%BD%D5%B6%D5%AB%D5%AF" title="Ալֆա-մասնիկ – Armenian" lang="hy" hreflang="hy" data-title="Ալֆա-մասնիկ" 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%85%E0%A4%B2%E0%A5%8D%E0%A4%AB%E0%A4%BE_%E0%A4%95%E0%A4%A3" title="अल्फा कण – Hindi" lang="hi" hreflang="hi" data-title="अल्फा कण" 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/Alfa-%C4%8Destica" title="Alfa-čestica – Croatian" lang="hr" hreflang="hr" data-title="Alfa-čestica" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Partikel_Alfa" title="Partikel Alfa – Indonesian" lang="id" hreflang="id" data-title="Partikel Alfa" 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-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Particella_%CE%B1" title="Particella α – Italian" lang="it" hreflang="it" data-title="Particella α" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he badge-Q70893996 mw-list-item" title=""><a href="https://he.wikipedia.org/wiki/%D7%97%D7%9C%D7%A7%D7%99%D7%A7_%D7%90%D7%9C%D7%A4%D7%90" title="חלקיק אלפא – Hebrew" lang="he" hreflang="he" data-title="חלקיק אלפא" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%85%E0%B2%B2%E0%B3%8D%E0%B2%AB_%E0%B2%95%E0%B2%A3" title="ಅಲ್ಫ ಕಣ – Kannada" lang="kn" hreflang="kn" data-title="ಅಲ್ಫ ಕಣ" 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%9A%E1%83%A4%E1%83%90-%E1%83%9C%E1%83%90%E1%83%AC%E1%83%98%E1%83%9A%E1%83%90%E1%83%99%E1%83%98" title="ალფა-ნაწილაკი – Georgian" lang="ka" hreflang="ka" data-title="ალფა-ნაწილაკი" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%90%D0%BB%D1%8C%D1%84%D0%B0-%D0%B1%D3%A9%D0%BB%D1%88%D0%B5%D0%BA" title="Альфа-бөлшек – Kazakh" lang="kk" hreflang="kk" data-title="Альфа-бөлшек" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Patikil_alfa" title="Patikil alfa – Haitian Creole" lang="ht" hreflang="ht" data-title="Patikil alfa" 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/T%C3%AEr%C3%AAj%C3%AAn_alfay%C3%AA" title="Tîrêjên alfayê – Kurdish" lang="ku" hreflang="ku" data-title="Tîrêjên alfayê" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Alfa_da%C4%BCi%C5%86a" title="Alfa daļiņa – Latvian" lang="lv" hreflang="lv" data-title="Alfa daļiņa" 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/Alfa_dalel%C4%97" title="Alfa dalelė – Lithuanian" lang="lt" hreflang="lt" data-title="Alfa dalelė" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lij mw-list-item"><a href="https://lij.wikipedia.org/wiki/Raggi_alfa" title="Raggi alfa – Ligurian" lang="lij" hreflang="lij" data-title="Raggi alfa" data-language-autonym="Ligure" data-language-local-name="Ligurian" class="interlanguage-link-target"><span>Ligure</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%90%D0%BB%D1%84%D0%B0-%D1%87%D0%B5%D1%81%D1%82%D0%B8%D1%87%D0%BA%D0%B0" title="Алфа-честичка – Macedonian" lang="mk" hreflang="mk" data-title="Алфа-честичка" 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%86%E0%B5%BD%E0%B4%AB%E0%B4%BE_%E0%B4%95%E0%B4%A3%E0%B4%82" title="ആൽഫാ കണം – Malayalam" lang="ml" hreflang="ml" data-title="ആൽഫാ കണം" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Zarah_alfa" title="Zarah alfa – Malay" lang="ms" hreflang="ms" data-title="Zarah alfa" 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-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%9A%E1%80%BA%E1%80%9C%E1%80%BA%E1%80%96%E1%80%AC%E1%80%A1%E1%80%99%E1%80%BE%E1%80%AF%E1%80%94%E1%80%BA" title="အယ်လ်ဖာအမှုန် – Burmese" lang="my" hreflang="my" data-title="အယ်လ်ဖာအမှုန်" 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/Alfadeeltje" title="Alfadeeltje – Dutch" lang="nl" hreflang="nl" data-title="Alfadeeltje" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%A2%E3%83%AB%E3%83%95%E3%82%A1%E7%B2%92%E5%AD%90" title="アルファ粒子 – Japanese" lang="ja" hreflang="ja" data-title="アルファ粒子" 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/Alfapartikkel" title="Alfapartikkel – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Alfapartikkel" 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/Alfapartikkel" title="Alfapartikkel – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Alfapartikkel" 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-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Alfa-zarralar" title="Alfa-zarralar – Uzbek" lang="uz" hreflang="uz" data-title="Alfa-zarralar" 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%85%E0%A8%B2%E0%A8%AB%E0%A8%BE_%E0%A8%95%E0%A8%A3" title="ਅਲਫਾ ਕਣ – Punjabi" lang="pa" hreflang="pa" data-title="ਅਲਫਾ ਕਣ" 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%84%D9%81%D8%A7_%D9%BE%D8%A7%D8%B1%D9%B9%DB%8C%DA%A9%D9%84" title="ایلفا پارٹیکل – Western Punjabi" lang="pnb" hreflang="pnb" data-title="ایلفا پارٹیکل" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-nds badge-Q70894304 mw-list-item" title=""><a href="https://nds.wikipedia.org/wiki/Alphadeelken" title="Alphadeelken – Low German" lang="nds" hreflang="nds" data-title="Alphadeelken" data-language-autonym="Plattdüütsch" data-language-local-name="Low German" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl badge-Q70894304 mw-list-item" title=""><a href="https://pl.wikipedia.org/wiki/Cz%C4%85stka_alfa" title="Cząstka alfa – Polish" lang="pl" hreflang="pl" data-title="Cząstka alfa" 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/Part%C3%ADcula_alfa" title="Partícula alfa – Portuguese" lang="pt" hreflang="pt" data-title="Partícula alfa" 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/Particul%C4%83_alfa" title="Particulă alfa – Romanian" lang="ro" hreflang="ro" data-title="Particulă alfa" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%90%D0%BB%D1%8C%D1%84%D0%B0-%D1%87%D0%B0%D1%81%D1%82%D0%B8%D1%86%D0%B0" title="Альфа-частица – Russian" lang="ru" hreflang="ru" data-title="Альфа-частица" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%87%E0%B6%BD%E0%B7%8A%E0%B7%86%E0%B7%8F_%E0%B6%85%E0%B6%82%E0%B7%81%E0%B7%94%E0%B7%80" title="ඇල්ෆා අංශුව – Sinhala" lang="si" hreflang="si" data-title="ඇල්ෆා අංශුව" data-language-autonym="සිංහල" data-language-local-name="Sinhala" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/%C4%8Castica_alfa" title="Častica alfa – Slovak" lang="sk" hreflang="sk" data-title="Častica alfa" 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/Delec_alfa" title="Delec alfa – Slovenian" lang="sl" hreflang="sl" data-title="Delec alfa" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AA%DB%95%D9%86%DB%86%DA%A9%DB%95%DB%8C_%D8%A6%DB%95%D9%84%D9%81%D8%A7" title="تەنۆکەی ئەلفا – Central Kurdish" lang="ckb" hreflang="ckb" data-title="تەنۆکەی ئەلفا" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Alfa_%C4%8Destica" title="Alfa čestica – Serbian" lang="sr" hreflang="sr" data-title="Alfa čestica" 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/Alfa-%C4%8Destica" title="Alfa-čestica – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Alfa-čestica" 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-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Alfahiukkanen" title="Alfahiukkanen – Finnish" lang="fi" hreflang="fi" data-title="Alfahiukkanen" 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/Alfastr%C3%A5lning" title="Alfastrålning – Swedish" lang="sv" hreflang="sv" data-title="Alfastrålning" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%86%E0%AE%B2%E0%AF%8D%E0%AE%83%E0%AE%AA%E0%AE%BE_%E0%AE%A4%E0%AF%81%E0%AE%95%E0%AE%B3%E0%AF%8D" title="ஆல்ஃபா துகள் – Tamil" lang="ta" hreflang="ta" data-title="ஆல்ஃபா துகள்" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%99%E0%B8%B8%E0%B8%A0%E0%B8%B2%E0%B8%84%E0%B9%81%E0%B8%AD%E0%B8%A5%E0%B8%9F%E0%B8%B2" title="อนุภาคแอลฟา – Thai" lang="th" hreflang="th" data-title="อนุภาคแอลฟา" 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/Alfa_par%C3%A7ac%C4%B1%C4%9F%C4%B1" title="Alfa parçacığı – Turkish" lang="tr" hreflang="tr" data-title="Alfa parçacığı" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%90%D0%BB%D1%8C%D1%84%D0%B0-%D1%87%D0%B0%D1%81%D1%82%D0%B8%D0%BD%D0%BA%D0%B0" title="Альфа-частинка – Ukrainian" lang="uk" hreflang="uk" data-title="Альфа-частинка" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/H%E1%BA%A1t_alpha" title="Hạt alpha – Vietnamese" lang="vi" hreflang="vi" data-title="Hạt alpha" 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-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Partikulo_Alpha" title="Partikulo Alpha – Waray" lang="war" hreflang="war" data-title="Partikulo Alpha" 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/%CE%91%E7%B2%92%E5%AD%90" title="Α粒子 – Wu" lang="wuu" hreflang="wuu" data-title="Α粒子" 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-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E7%94%B2%E7%A8%AE%E5%B0%84%E7%B6%AB" title="甲種射綫 – Cantonese" lang="yue" hreflang="yue" data-title="甲種射綫" 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.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-No_sources plainlinks metadata ambox ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-4.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/50px-Question_book-4.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/75px-Question_book-4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/100px-Question_book-4.svg.png 2x" data-file-width="262" data-file-height="204" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>does not have any <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">sources</a></b>.<span class="hide-when-compact"> You can help Wikipedia by finding <a href="/wiki/Wikipedia:RELIABLE" class="mw-redirect" title="Wikipedia:RELIABLE">good</a> sources, and adding them.</span> <span class="date-container"><i>(<span class="date">April 2021</span>)</i></span></div></td></tr></tbody></table> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Alpha_Decay.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Alpha_Decay.svg/200px-Alpha_Decay.svg.png" decoding="async" width="200" height="136" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Alpha_Decay.svg/300px-Alpha_Decay.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/79/Alpha_Decay.svg/400px-Alpha_Decay.svg.png 2x" data-file-width="250" data-file-height="170" /></a><figcaption>A diagram of alpha decay</figcaption></figure> <p>An <b>alpha particle</b> is a <a href="/wiki/Radioactive" class="mw-redirect" title="Radioactive">radioactive</a> particle that is made up of two <a href="/wiki/Protons" class="mw-redirect" title="Protons">protons</a> and two <a href="/wiki/Neutrons" class="mw-redirect" title="Neutrons">neutrons</a>. It is a <a href="/wiki/Helium" title="Helium">helium</a> <a href="/wiki/Atomic_nucleus" title="Atomic nucleus">nucleus</a>: that is a helium atom without <a href="/wiki/Electron" title="Electron">electrons</a>. Radioactive elements give out alpha particles when they go through a kind of <a href="/wiki/Radioactive_decay" title="Radioactive decay">radioactive decay</a>, known as <a href="/wiki/Radioactive_decay#Alpha_decay" title="Radioactive decay">alpha decay</a>. </p><p>During alpha decay, the <a href="/wiki/Atomic_nucleus" title="Atomic nucleus">atomic nucleus</a> releases an alpha particle. The nucleus will lose two protons and two neutrons when this happens. After the decay, the atom will change to another element, because the atom loses two protons. For example, when <a href="/wiki/Americium" title="Americium">americium</a> goes through alpha decay it changes into <a href="/wiki/Neptunium" title="Neptunium">neptunium</a> because neptunium is defined to have two protons less than <a href="/wiki/Americium" title="Americium">americium</a>. Alpha decay usually happens in heavy elements, those containing more neutrons and protons, such as <a href="/wiki/Uranium" title="Uranium">uranium</a>, <a href="/wiki/Thorium" title="Thorium">thorium</a>, <a href="/wiki/Plutonium" title="Plutonium">plutonium</a>, and <a href="/wiki/Radium" title="Radium">radium</a>. </p><p>Alpha particles cannot even go through a few centimetres of air. Alpha <a href="/wiki/Radiation" title="Radiation">radiation</a> cannot hurt humans when the alpha source is outside the <a href="/wiki/Human_body" title="Human body">human body</a>, because human skin does not let the alpha particles go through, it cannot <i>penetrate</i> it. Alpha <a href="/wiki/Radiation" title="Radiation">radiation</a> can be very harmful if the source is inside the body, such as when people breathe dust or <a href="/wiki/Gas" title="Gas">gas</a> containing materials which decay by emitting alpha particles. </p><p>To look at americium again, the <a href="/wiki/Isotope" title="Isotope">isotope</a> <a href="/wiki/Americium" title="Americium">americium</a>-241 gives off alpha radiation. This radiation can be very harmful if it is inside someone's body because it can change the <a href="/wiki/DNA" title="DNA">DNA</a> in the <a href="/wiki/Cells" class="mw-redirect" title="Cells">cells</a>. But it is not harmful when it is outside of the body because alpha radiation does not travel through the outside layers of the skin very well. </p><p>When scientists write equations about <a href="/wiki/Nuclear_reaction" title="Nuclear reaction">nuclear reactions</a> they use the Greek letter <a href="/wiki/Alpha_(letter)" class="mw-redirect" title="Alpha (letter)">Alpha</a>. <a href="/wiki/Ernest_Rutherford" title="Ernest Rutherford">Ernest Rutherford</a> started this when he discovered and named three kinds of <a href="/wiki/Ionization" title="Ionization">ionizing</a> radiation. </p><p><br /> </p> <div class="boilerplate metadata plainlinks" id="stub"><span typeof="mw:File"><a href="/wiki/File:Science.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Science.jpg/30px-Science.jpg" decoding="async" width="30" height="32" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Science.jpg/45px-Science.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/54/Science.jpg/60px-Science.jpg 2x" data-file-width="70" data-file-height="75" /></a></span> <i>This <a href="/wiki/Wikipedia:Stub" title="Wikipedia:Stub">short article</a> about <a href="/wiki/Category:Physics_stubs" title="Category:Physics stubs">physics</a> can be made longer. 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