caesium

US cesium

/ (ˈsiːzɪəm) /

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noun

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.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 4|Various
It led Bunsen himself almost immediately to the isolation of two new elements of the alkali group, caesium and rubidium.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4|Various
This residue consists of sodium, potassium and lithium chlorides, with small quantities of caesium and rubidium chlorides.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4|Various

Caesium sulphate, Cs2SO4, may be prepared by dissolving the hydroxide or carbonate in sulphuric acid.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4|Various