actinium

See also: Actinium

English

Chemical element
Ac
Previous: radium (Ra)
Next: thorium (Th)

Some actinium-225, glowing due to its radioactivity. (The longest-lived isotope of actinium is actinium-227, not 225.)

Etymology

Borrowed from French actinium. actin- +‎ -ium.

Pronunciation

• enPR: ăktĭn'ēəm, IPA^(key): /ækˈtɪniəm/

• Audio (Southern England):

  (file)

Noun

actinium (usually uncountable, plural actiniums)

1. A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

Derived terms

Derived terms

• actinate
• actiniferous
• actinide
• actinium A
• actinium B
• actinium C
• actinium emanation
• actinium-K
• actinium fluoride
• actinium series
• eka-actinium
• protactinium
• radioactinium

Related terms

Related terms

• actinism
• actino-
• actinoid
• actinon

Translations

chemical element

• Afrikaans: aktinium (af)
• Albanian: aktin, aktinium m
• Arabic: أَكْتِينْيُوم m (ʔaktinyum)
• Armenian: ակտինիում (hy) (aktinium)
• Asturian: actiniu (ast) m
• Azerbaijani: aktinium
• Basque: aktinioa
• Belarusian: актыній m (aktynij)
• Breton: aktiniom (br)
• Bulgarian: актиний m (aktinij)
• Burmese: အက်တီနီယမ် (aktiniyam)
• Catalan: actini (ca) m
• Chinese:

  Mandarin: 錒／锕 (zh) (ā)

• Cornish: actynyum
• Czech: aktinium (cs) n
• Danish: actinium (da)
• Dutch: actinium (nl) n
• Esperanto: aktinio (eo)
• Estonian: aktiinium (et)
• Faroese: actinium
• Finnish: aktinium (fi)
• French: actinium (fr) m
• Friulian: atini
• Galician: actinio (gl) m
• Georgian: აქტინიუმი (akṭiniumi)
• German: Actinium (de) n
• Greek: ακτίνιο (el) n (aktínio)
• Hebrew: אַקְטִינְיוּם (he) m (aktínyum)
• Hindi: एक्टिनियम (ekṭiniyam), एजातु (ejātu)
• Hungarian: aktínium (hu)
• Icelandic: aktín (is)
• Irish: achtainiam m
• Italian: attinio (it) m
• Japanese: アクチニウム (ja) (akuchiniumu)
• Kashubian: aktin
• Kazakh: актиний (kk) (aktinii)
• Khmer: អាក់ទីញ៉ូម (ʼaktiiñoum)
• Korean: 악티늄 (ko) (aktinyum)
• Kyrgyz: актиний (aktiniy)
• Latin: actinium (la) n
• Latvian: aktīnijs
• Lithuanian: aktinis (lt)
• Luxembourgish: Aktinium
• Macedonian: актиниум m (aktinium)
• Malay: aktinium
• Maltese: aktinjum
• Manx: aghtinnium
• Mongolian: актини (mn) (aktini)
• Norwegian:

  Bokmål: actinium (no) n

• Persian: اکتینیم (fa) (aktiniyom)
• Polish: aktyn (pl) m
• Portuguese: actínio (pt) m
• Romanian: actiniu (ro) n
• Russian: акти́ний (ru) m (aktínij)
• Sanskrit: एजातु m (ejātu)
• Scottish Gaelic: aictiniam
• Serbo-Croatian:

  Cyrillic: актинијум m, актиниј m

  Roman: aktinijum m, aktinij (sh) m

• Slovak: aktínium (sk) n
• Slovene: aktinij (sl)
• Spanish: actinio (es) m
• Swedish: aktinium (sv) n
• Tajik: актиний (aktiniy)
• Tamil: அக்டினியம் (ta) (akṭiṉiyam)
• Thai: แอกทิเนียม (ɛ́k-tí-nîiam)
• Tibetan: ཨེག་ཊི་ནིམ (eg ṭi nim)
• Turkish: aktinyum (tr)
• Turkmen: aktiniý
• Ukrainian: акти́ній (uk) m (aktýnij)
• Urdu: عیکٹنیئم
• Uyghur: ئاكتىنىي (aktiniy)
• Uzbek: aktiniy (uz)

  Cyrillic: актиний (uz) (aktiniy)

• Vietnamese: actini
• Volapük: laktinin (vo)
• Welsh: actiniwm (cy)
• West Frisian: actinium

Danish

Alternative forms

• aktinium

Noun

actinium

1. actinium

Dutch

Chemical element
Ac
Previous: radium (Ra)
Next: thorium (Th)

Etymology

Borrowed from French actinium.

Pronunciation

• IPA^(key): /ɑkˈti.ni.ʏm/

• Audio:

  (file)

• Hyphenation: ac‧ti‧ni‧um

Noun

actinium n (uncountable)

1. actinium [from ca. 1900]

Related terms

• actinide

French

Pronunciation

• IPA^(key): /ak.ti.njɔm/

• Audio:

  (file)

Noun

actinium m (uncountable)

1. actinium

Further reading

• “actinium”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Latin

Etymology

From Ancient Greek ἀκτίς, ἀκτῖν- (aktís, aktîn-, “ray”).

Pronunciation

• (Classical Latin) IPA^(key): /akˈtiː.ni.um/, [äkˈt̪iːniʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /akˈti.ni.um/, [äkˈt̪iːnium]

Noun

actīnium n (genitive actīniī); second declension

1. actinium

Declension

Second-declension noun (neuter).

Case	Singular	Plural
Nominative	actīnium	actīnia
Genitive	actīniī	actīniōrum
Dative	actīniō	actīniīs
Accusative	actīnium	actīnia
Ablative	actīniō	actīniīs
Vocative	actīnium	actīnia

Norwegian Bokmål

Chemical element
Ac
Previous: radium (Ra)
Next: thorium (Th)

Electron shell diagram for Actinium, the 89th element in the periodic table of elements.

Etymology

First part actin- from Ancient Greek ἀκτίς (aktís, “ray, beam”), from Proto-Hellenic [Term?], from Proto-Indo-European *nókʷ-t-u-s ~ *n̥kʷ-t-éw-s, from *nókʷts (“night”), from *negʷ- (“bare, naked”). Last part from Latin -ium (forms names of chemical elements), from -ius (forms adjectives), from Old Latin -iōs, from Proto-Italic *-jos (forms comparative adverbs), from Proto-Indo-European *-yōs ~ *-is- (forms adjectives).

Pronunciation

• IPA^(key): /akˈtiːnɪʉm/

• Audio:

  (file)

• Rhymes: -ʉm
• Hyphenation: ac‧ti‧ni‧um

Noun

actinium n (definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene)

1. (organic chemistry) actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores)
   • 2015, periodesystemet.no:

     actinium får nitrogenet i luften til å lyse blått

     actinium causes the nitrogen in the air to glow blue

References

• “actinium” in The Bokmål Dictionary.
• “actinium” in Det Norske Akademis ordbok (NAOB).
• “actinium” in Store norske leksikon