Properties of astatine atoms

Ionisation Energies and electron affinity

The electron affinity of astatine is 270.1  kJ mol-1. The ionisation energies of astatine are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 920

Ionisation energies of At

Electronic configuration

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

Pointer to The Orbitron gallery of orbitals.

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

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astatine atomic number