Periodic table of elements

55 - Cesium [Cs]

55: Cesium - Cesium [Cs]
Group: 1
Period: 6
Atomic number: 55
Atomic mass: 132.9054519
Configuration: [Xe] 6s1
Atomic radius: 298 pm
Covalent radius: 244 pm
Electron affinity: 45.5 eV
Ionization energy: 3.8939 eV
Electronic term: 2S1/2
Mass fraction in the earth crust: 0.0000019
Mass fraction in the earth space: 0.0000000008
Electronegativity: 0.79

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