Definitions of caesium
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a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
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synonyms:
Cs, atomic number 55, cesium
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types:
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cesium 137
a radioactive isotope of cesium used in radiation therapy
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type of:
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metal, metallic element
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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cesium 137
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