/ (ˈsiːzɪəm) /
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a 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
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Words nearby caesium
Caesarean section, 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
How to use caesium in a sentence
Like caesium, it is precipitated with platinic chloride, and in the ordinary course of work would be weighed as potassium.A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
Lithia and fluorine are each present to the extent of about 5%; rubidium and caesium are sometimes present in small amounts.
It led Bunsen himself almost immediately to the isolation of two new elements of the alkali group, caesium and rubidium.
This residue consists of sodium, potassium and lithium chlorides, with small quantities of caesium and rubidium chlorides.
Caesium sulphate, Cs2SO4, may be prepared by dissolving the hydroxide or carbonate in sulphuric acid.