Properties of thallium atoms

Ionisation Energies and electron affinity

The electron affinity of thallium is 19.2  kJ mol-1. The ionisation energies of thallium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 589.4
2nd 1971
3rd 2878

Ionisation energies of Tl

Electronic configuration

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

Pointer to The Orbitron gallery of orbitals.

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

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thallium atomic number