Properties of helium atoms

Ionisation Energies and electron affinity

The electron affinity of helium is 0  kJ mol-1. The ionisation energies of helium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 2372.3
2nd 5250.5

Ionisation energies of He

Electronic configuration

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

Pointer to The Orbitron gallery of orbitals.

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

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helium atomic number