Properties of selenium atoms

Ionisation Energies and electron affinity

The electron affinity of selenium is 195.0  kJ mol-1. The ionisation energies of selenium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 941.0
2nd 2045
3rd 2973.7
4th 4144
5th 6590
6th 7880
7th 14990

Ionisation energies of Se

Electronic configuration

The following represents the electronic configuration and its associated term symbol for the ground state neutral gaseous atom. The configuration associated with selenium in its compounds is not necessarily the same.

Pointer to The Orbitron gallery of orbitals.

Kossel shell structure of Se
A schematic representation of the shell structure of selenium - not what the atom of selenium "looks like".

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selenium atomic number