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Cs

Cesium

#55 · Alkali Metal

Mass132.91 u
Density1.873 g/cm³
Melting301.59 K
Boiling944.0 K
Electronegativity0.79
Ionization Energy375.7 kJ/mol
Atomic Radius265.0 pm
Blocks-block
State (RT)Solid
Config[Xe] 6s1
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