Cs
Caesium

Cesium is a soft, silvery-white alkali metal from the periodic table. It is highly reactive and readily forms compounds with other elements. Cesium is used in atomic clocks and in spectroscopy, as well as in the production of photoelectric cells and vacuum tubes.

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Atomic number55
GroupIA
Period6
Mass132.90546
Latin nameCaesium
Electron configuration[Xe]6s
Oxidation state-1, 0, 1