caesium

[see-zee-uhm]
noun Chemistry.
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caesium or (US) cesium (ˈsiːzɪəm)
 
n
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
 
cesium or (US) cesium
 
n

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Example sentences
Caesium is a problem as this dissolves in the fat tissue and stays there.
Radioactive caesium, uranium and plutonium are harmful, but do not target any particular organ of the body.
Caesium is used as a catalyst in the hydrogenation of certain organic compounds.
Caesium is also used as an internal standard in spectrophotometry.
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