Periodic table of elements

34 - Selenium [Se]

34: Selenium - Selenium [Se]
Group: 16
Period: 4
Atomic number: 34
Atomic mass: 78.96
Configuration: [Ar] 3d104s24p4
Atomic radius: 103 pm
Covalent radius: 120 pm
Electron affinity: 195 eV
Ionization energy: 9.7524 eV
Electronic term: 3P2
Mass fraction in the earth crust: 0.00000005
Mass fraction in the earth space: 0.00000003
Electronegativity: 2.55

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