Periodic Table of Elements showing Selenium nonmetal elements


Atomic Number34
Molar Mass78.96 gmol-1
Electron Configuration[Ar]3d104s24p4
Normal Statesolid nonmetal
Density @STP4.81 g cm-3
Melting Point221oC
Boiling Point685oC
Stable Isotopes74Se, 76Se, 77Se, 78Se, 80Se, 82Se
Atomic Radius117 pm
Ionic Radius198 (2-) pm
Electronegativity (Pauling)2.55
Ionization Energy (1st)941 kJ mol-1
Ionization Energy (2nd)2044 kJ mol-1
Ionization Energy (3rd)2974 kJ mol-1
Molar Heat Capacity25.4 J K-1mol-1
Standard Molar Entropy42.4 J K-1mol-1
Enthalpy of Fusion5.1 kJ mol-1
Enthalpy of Vapourization26.32 kJ mol-1
[Back to Periodic table]

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