CESIUM
- a silver-white soft ductile element of the alkali metal group that is the most electropositive element known and that is used especially in photoelectric cells see element table
- 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
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