Definify.com
Webster 1913 Edition
Actinium
Ac-tin′i-um
,Noun.
[Gr. [GREEK], [GREEK], ray.]
(Chem.)
A supposed metal, said by Phipson to be contained in commercial zinc; – so called because certain of its compounds are darkened by exposure to light.
Definition 2025
Actinium
Actinium
See also: actinium
German
Noun
Actinium n (genitive Actiniums, no plural)
Declension
Declension of Actinium (uncountable)
See also
Luxembourgish
| Chemical element | |
|---|---|
| Ac | Previous: Radium (Ra) |
| Next: Thorium (Th) | |
Noun
Actinium ? (uncountable)
actinium
actinium
See also: Actinium
English
| Chemical element | |
|---|---|
| Ac | Previous: radium (Ra) |
| Next: thorium (Th) | |
Noun
actinium (uncountable)
- 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
|
|
Dutch
| Chemical element | |
|---|---|
| Ac | Previous: radium (Ra) |
| Next: thorium (Th) | |
Pronunciation
Noun
actinium n (uncountable)