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atomic number 55

DEFINITIONS OF: atomic number 55

1

n a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

Synonyms:
Cs, caesium, cesium
Types:
cesium 137
a radioactive isotope of cesium used in radiation therapy
Type of:
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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