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Nov 28, 2009
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ce•si•um



Pronunciation: (sē'zē-um), [key]
—n.
a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20°C; melts at 28.5°C. Also,caesium.

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

Cesenacesium 137
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