| 单词 | cesium |
| 释义 | cesium /see"zee euhm/, 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. [1930-35; < NL, special use of L caesium, neut. of caesius bluish-grey; see -IUM] |
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