Properties of actinium atoms

Ionisation Energies and electron affinity

The electron affinity of actinium is no data  kJ mol-1. The ionisation energies of actinium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 499
2nd 1170

Ionisation energies of Ac

Electronic configuration

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

Pointer to The Orbitron gallery of orbitals.

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

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actinium atomic number