Neptunium

Properties of neptunium atoms

The electron affinity of neptunium is no data  kJ mol^-1.

Ionisation Energies

This section includes ionisation energies of neptunium.

Electronic configuration

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

• Ground state electron configuration:  [Rn].5f⁴.6d¹.7s²
• Shell structure:  2.8.18.32.22.9.2
• Term symbol:   ⁶L_11/2

A schematic representation of the shell structure of neptunium - not what the atom of neptunium "looks like".

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