What is a pseudo-noble gas configuration? Give an example of one ion from Group 3A (13) that has it.

Pseudo-noble gas configuration which can also be called pseudo inert configuration is when elements have fully filled d-orbital, along with s - and p - orbitals. Examples are ions of elements, this is because they lose their valence electrons to be fully filled in order to have a stable octet.

Example of Group 3A (13) ion is Aluminium ion; Al3+. Al3 + takes up the configuration of Neon when it loses its 3 valence electrons.

Electronic configuration of Al and Al3+

Al = [Ne] 3s2 3p1

Al3 + = 1s2 2s2 2p6