单词 | caesium |
释义 | Example sentences from the Web for caesiumcaesiumUS cesium/ (ˈsiːzɪəm) / nouna ductile silvery-white element of the alkali metal group that is the most electropositive metal. It occurs in pollucite and lepidolite and is used in photocells. The radioisotope caesium-137, with a half-life of 30.2 years, is used in radiotherapy. Symbol: Cs; atomic no: 55; atomic wt: 132.90543; valency: 1; relative density: 1.873; melting pt: 28.39±0.01°C; boiling pt: 671°C Words nearby caesiumcaesarian, Caesarism, caesaropapism, Caesar salad, caesious, caesium, caesium clock, caespitose, caesura, Caetano, C.A.F. Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 |
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