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caesium
/ ˈsiːzɪəm /
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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Example Sentences
Like caesium, it is precipitated with platinic chloride, and in the ordinary course of work would be weighed as potassium.
From Project Gutenberg
Lithia and fluorine are each present to the extent of about 5%; rubidium and caesium are sometimes present in small amounts.
From Project Gutenberg
It led Bunsen himself almost immediately to the isolation of two new elements of the alkali group, caesium and rubidium.
From Project Gutenberg
This residue consists of sodium, potassium and lithium chlorides, with small quantities of caesium and rubidium chlorides.
From Project Gutenberg
Caesium sulphate, Cs2SO4, may be prepared by dissolving the hydroxide or carbonate in sulphuric acid.
From Project Gutenberg
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