View source for actinium

{{also|Actinium}}
==English==
{{elements|en|Ac|radium|Ra|thorium|Th}}
{{wp}}
[[File:Isotope used in cancer therapy (34431509905).jpg|thumb|Some '''actinium'''-225, glowing due to its [[radioactivity]]. (The longest-lived [[isotope]] of actinium is actinium-227, not 225.)]]

===Etymology===
Borrowed from {{bor|en|fr|actinium}}. {{confix|en|actin|ium}}.

===Pronunciation===
* {{enPR|ăktĭn'ēəm}}, {{IPA|en|/ækˈtɪniəm/}}
* {{audio|en|LL-Q1860 (eng)-Vealhurl-actinium.wav|a=Southern England}}

===Noun===
{{en-noun|-|s}}

# A [[radioactive]], [[metallic]] [[chemical]] [[element]] (''symbol'': [[Ac]]) with an [[atomic number]] of 89; found in [[uranium]] [[ore]]s.

====Derived terms====
{{der-top}}
*{{l|en|actinate}}
*{{l|en|actiniferous}}
* {{l|en|actinide}}
* {{l|en|actinium A}}
* {{l|en|actinium B}}
* {{l|en|actinium C}}
* {{l|en|actinium emanation}}
* {{l|en|actinium-K}}
* {{l|en|actinium fluoride}}
* {{l|en|actinium series}}
* {{l|en|eka-actinium}}
* {{l|en|protactinium}}
* {{l|en|radioactinium}}
{{der-bottom}}

====Related terms====
{{rel-top}}
* {{l|en|actinism}}
* {{l|en|actino-}}
* {{l|en|actinoid}}
* {{l|en|actinon}}
{{rel-bottom}}

====Translations====
{{trans-top|chemical element}}
* Afrikaans: {{t+|af|aktinium}}
* Albanian: {{t|sq|aktin}}, {{t|sq|aktinium|m}}
* Arabic: {{t|ar|أَكْتِينْيُوم|m|tr=ʔaktinyum}}
* Armenian: {{t+|hy|ակտինիում}}
* Asturian: {{t+|ast|actiniu|m}}
* Azerbaijani: {{t|az|aktinium}}
* Basque: {{t|eu|aktinioa}}
* Belarusian: {{t|be|актыній|m}}
* Breton: {{t+|br|aktiniom}}
* Bulgarian: {{t|bg|актиний|m}}
* Burmese: {{t|my|အက်တီနီယမ်}}
* Catalan: {{t+|ca|actini|m}}
* Chinese:
*: Mandarin: {{t+|cmn|錒|tr=ā}}
* Cornish: {{t|kw|actynyum}}
* Czech: {{t+|cs|aktinium|n}}
* Danish: {{t+|da|actinium}}
* Dutch: {{t+|nl|actinium|n}}
* Esperanto: {{t+|eo|aktinio}}
* Estonian: {{t+|et|aktiinium}}
* Faroese: {{t|fo|actinium}}
* Finnish: {{t+|fi|aktinium}}
* French: {{t+|fr|actinium|m}}
* Friulian: {{t|fur|atini}}
* Galician: {{t+|gl|actinio|m}}
* Georgian: {{t|ka|აქტინიუმი}}
* German: {{t+|de|Actinium|n}}
* Greek: {{t+|el|ακτίνιο|n}}
* Hebrew: {{t+|he|אַקְטִינְיוּם|m|tr=aktínyum}}
* Hindi: {{t|hi|एक्टिनियम}}, {{t|hi|एजातु}}
* Hungarian: {{t+|hu|aktínium}}
* Icelandic: {{t+|is|aktín}}
* Irish: {{t|ga|achtainiam|m}}
* Italian: {{t+|it|attinio|m}}
* Japanese: {{t+|ja|アクチニウム|tr=akuchiniumu}}
* Kashubian: {{t|csb|aktin}}
* Kazakh: {{t+|kk|актиний}}
* Khmer: {{t|km|អាក់ទីញ៉ូម}}
* Korean: {{t+|ko|악티늄}}
* Kyrgyz: {{t|ky|актиний}}
* Latin: {{t+|la|actinium|n}}
* Latvian: {{t|lv|aktīnijs}}
* Lithuanian: {{t+|lt|aktinis}}
* Luxembourgish: {{t|lb|Aktinium}}
* Macedonian: {{t|mk|актиниум|m}}
* Malay: {{t|ms|aktinium}}
* Maltese: {{t|mt|aktinjum}}
* Manx: {{t|gv|aghtinnium}}
* Mongolian: {{t+|mn|актини}}
* Norwegian:
*: Bokmål: {{t+|nb|actinium|n}}
* Persian: {{t+|fa|اکتینیم|tr=aktiniyom}}
* Polish: {{t+|pl|aktyn|m}}
* Portuguese: {{t+|pt|actínio|m}}
* Romanian: {{t+|ro|actiniu|n}}
* Russian: {{t+|ru|акти́ний|m}}
* Sanskrit: {{t|sa|एजातु|m}}
* Scottish Gaelic: {{t|gd|aictiniam}}
* Serbo-Croatian:
*: Cyrillic: {{t|sh|актинијум|m|sc=Cyrl}}, {{t|sh|актиниј|m|sc=Cyrl}}
*: Roman: {{t|sh|aktinijum|m}}, {{t+|sh|aktinij|m}}
* Slovak: {{t+|sk|aktínium|n}}
* Slovene: {{t+|sl|aktinij}}
* Spanish: {{t+|es|actinio|m}}
* Swedish: {{t+|sv|aktinium|n}}
* Tajik: {{t|tg|актиний}}
* Tamil: {{t+|ta|அக்டினியம்}}
* Thai: {{t|th|แอกทิเนียม}}
* Tibetan: {{t|bo|ཨེག་ཊི་ནིམ}}
* Turkish: {{t+|tr|aktinyum}}
* Turkmen: {{t|tk|aktiniý}}
* Ukrainian: {{t+|uk|акти́ній|m}}
* Urdu: {{t|ur|عیکٹنیئم}}
* Uyghur: {{t|ug|ئاكتىنىي}}
* Uzbek: {{t+|uz|aktiniy}}
*: Cyrillic: {{t+|uz|актиний}}
* Vietnamese: {{t|vi|actini}}
* Volapük: {{t+|vo|laktinin}}
* Welsh: {{t+|cy|actiniwm}}
* West Frisian: {{t|fy|actinium}}
{{trans-bottom}}

{{C|en|Actinide series chemical elements}}

==Danish==

===Alternative forms===
* {{alt|da|aktinium}}

===Noun===
{{da-noun}}

# actinium

==Dutch==
{{wikipedia|lang=nl}}
{{elements|nl|Ac|radium|Ra|thorium|Th}}

===Etymology===
Borrowed from {{bor|nl|fr|actinium}}.

===Pronunciation===
* {{IPA|nl|/ɑkˈti.ni.ʏm/}}
* {{audio|nl|Nl-actinium.ogg}}
* {{hyphenation|nl|ac|ti|ni|um }}

===Noun===
{{nl-noun|n|-|-}}

# {{l|en|actinium}} {{defdate|from ca. 1900}}

====Related terms====
* {{l|nl|actinide}}

==French==
{{wikipedia|lang=fr}}

===Pronunciation===
* {{fr-IPA}}
* {{audio|fr|LL-Q150 (fra)-LoquaxFR-actinium.wav}}

===Noun===
{{fr-noun|m|-}}

# {{l|en|actinium}}

===Further reading===
* {{R:fr:TLFi}}

{{C|fr|Chemical elements}}

==Latin==
{{wikipedia|lang=la}}

===Etymology===
From {{der|la|grc|ἀκτίς|ἀκτίς, ἀκτῖν-|ray}}.

===Pronunciation===
* {{la-IPA|actīnium}}

===Noun===
{{la-noun|actīnium<2.-ium>}}

# {{l|en|actinium}}

====Declension====
{{la-ndecl|actīnium<2.-ium>}}

{{C|la|Chemical elements}}

==Norwegian Bokmål==
{{elements|nb|Ac|radium|Ra|thorium|Th}}
{{wp|lang=nb}}
[[Image:Electron shell 089 Actinium.svg|250px|thumb|Electron shell diagram for Actinium, the 89th element in the periodic table of elements.]]

===Etymology===
{{root|nb|ine-pro|*negʷ-}}
First part '''actin-''' from {{der|nb|grc|ἀκτίς||ray, beam}}, from {{der|nb|grk-pro|}}, from {{der|nb|ine-pro||*nókʷ-t-u-s ~ *n̥kʷ-t-éw-s}}, from {{m|ine-pro|*nókʷts||night}}, from {{m|ine-pro|*negʷ-||bare, naked}}. Last part from {{der|nb|la|-ium|pos=forms names of chemical elements}}, from {{m|la|-ius|pos=forms adjectives}}, from {{der|nb|itc-ola|-iōs}}, from {{der|nb|itc-pro|*-jos|pos=forms comparative adverbs}}, from {{der|nb|ine-pro|*-yōs|*-yōs ~ *-is-|pos=forms adjectives}}.

===Pronunciation===
* {{IPA|nb|/akˈtiːnɪʉm/}}
* {{audio|nb|nb-actinium.ogg}}
* {{rhymes|nb|ʉm}}
* {{hyph|nb|ac|ti|ni|um}}

===Noun===
{{nb-noun-n1}}

# {{lb|nb|organic chemistry}} {{l|en|actinium}} {{q|a [[radioactive]], [[metallic]] [[chemical]] [[element]] (''symbol'': [[Ac]]) with an [[atomic number]] of 89; found in [[uranium]] [[ore|ores]]}}
#* {{quote-web|nb|year=2015|work=periodesystemet.no|text=actinium får nitrogenet i luften til å lyse blått|t=actinium causes the nitrogen in the air to glow blue}}

===References===
* {{R:The Bokmål Dictionary}}
* {{R:NAOB}}
* “[http://www.snl.no/actinium actinium]” in ''Store norske leksikon''

{{C|nb|Chemical elements|Chemistry}}