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uranium

uranium (yOOrā'nēum) [key], radioactive metallic chemical element; symbol U; at. no. 92; at. wt. 238.0289; m.p. 1,132°C; b.p. 3,818°C; sp. gr. 19.1 at 25°C; valence +3, +4, +5, or +6.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on uranium from Infoplease:

uranium: meaning and definitions - uranium: Definition and Pronunciation

See more Encyclopedia articles on: Compounds and Elements

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