Se
Selenium
34
Atomic Number: 34
Atomic mass: 78.963
Ionization energy: 941
Electronaffinity: -195
Covalent radius: 116
Calculated radius: 103
Empirical radius: 115
Vanderwaals radius: 190
Electronegativity: 2.55
Density: 4.82
Oxidation states: -2, 2, 4, 6
Melting point: 494
Boiling point: 958
Electron configuration: [Ar] 3d10 4s2 4p4
Element group: 16
Element period: 4

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