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Actinium

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actinium
n. (Ac) radioactive metallic element (Chemistry)

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Actinium
Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Poloniumradium and radon were observed before actinium, but they were not isolated until 1902. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table.

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WordNet 2.0 Dictionary

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actinium

Noun
1. a radioactive element of the actinide series; found in uranium ores
(synonym) Ac, atomic number 89
(hypernym) chemical element, element
(substance-holonym) uranium ore


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Actinium (das)
n. actinium, radioactive chemical element

Babylon French English dictionary

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actinium
nm. actinium, radioactive metallic element


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