Question
Aluminium forms the ion Al3+, but not Al4+ why?

Answer

Aluminium $([\text{Ne}]^{3\text{s}^2}\text{3p}'$ can achien the electronic configuration of the nearest noble gas (Ne) by losing only three electrons. : Al3+ =1s22s22p6. Aluminium with not form the Al4+ ion because an extremely high amount of energy would be required to remove an electron from the stable noble gas configuration.

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