Definition of actinium Actinium
ac•tin•i•um
We found 6 definitions of actinium from 6 different sources.
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What does actinium mean?
WordNet
NounPlural: actiniums |
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| actinium - a radioactive element of the actinide series; found in uranium ores | ||
| Ac, atomic number 89 | ||
| chemical element, element the most favorable environment for a plant or animal; "water is the element of fishes" | ||
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Wiktionary 
Webster DictionaryWebster's Unabridged Dictionary 📘
- actinium (n.)
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.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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actinium
A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production.\n(Source: CED)
Wikipedia 
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Actinium is chemical element 89 on the periodic table. Its symbol is Ac. Actinium's mass is 227 g/mol.
Actinium is a silver radioactivesolid metal. It is so radioactive that it glows in the dark. Even a small amount of actinium is dangerous to people.
Actinium was discovered in 1899 by André-Louis Debierne, a French chemist.
Part of speech
🔤- actinium, noun, singular of actiniums.
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