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Dictionary

ac•tin•i•um

Pronunciation: (ak-tin'ē-um), [key]
—n. Chem.
a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. no.: 89; at. wt.: 227.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

actinism

actinium emanation

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