actinium
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Some actinium-225, glowing due to its radioactivity. (The longest-lived isotope of actinium is actinium-227, not 225.)
Electron shell diagram for Actinium, the 89th element in the periodic table of elements.
See also: Actinium
English
| Chemical element | |
|---|---|
| Ac | |
| Previous: radium (Ra) | |
| Next: thorium (Th) | |
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Etymology
Borrowed from French actinium. actin- + -ium.
Pronunciation
- enPR: ăktĭn'ēəm, IPA(key): /ækˈtɪniəm/
Audio (Southern England): (file)
Noun
actinium (usually uncountable, plural actiniums)
- A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.
Derived terms
Derived terms
Related terms
Translations
chemical element
|
Danish
Alternative forms
Noun
actinium
- actinium
Dutch
| Chemical element | |
|---|---|
| Ac | |
| Previous: radium (Ra) | |
| Next: thorium (Th) | |
Etymology
Borrowed from French actinium.
Pronunciation
Noun
actinium n (uncountable)
Related terms
French
Pronunciation
Noun
actinium m (uncountable)
Further reading
- “actinium”, in Trésor de la langue française informatisé , 2012.
Latin
Etymology
From Ancient Greek ἀκτίς, ἀκτῖν- (aktís, aktîn-, “ray”).
Pronunciation
- (Classical Latin) IPA(key): /akˈtiː.ni.um/,
- (modern Italianate Ecclesiastical) IPA(key): /akˈti.ni.um/,
Noun
actīnium n (genitive actīniī); second declension
Declension
Second-declension noun (neuter).
| 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) | |
Etymology
First part actin- from Ancient Greek ἀκτίς (aktís, “ray, beam”), from Proto-Hellenic , 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
Noun
actinium n (definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene)
- (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