Promethium

Properties of promethium atoms

Ionisation Energies and electron affinity

The electron affinity of promethium is 50  kJ mol^-1. The ionisation energies of promethium are given below.

Electronic configuration

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

• Ground state electron configuration:  [Xe].4f⁵.6s²
• Shell structure:  2.8.18.23.8.2
• Term symbol:   ⁶H_5/2

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

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