Question

alkaline earth metal always form divalent cations although second ionisation energies of metals are almost double than first ionisation energies explain?​

Answer 1

The reason is being Divalent cation it will achieve stable electronic configuration ie. is octet (nobel gas configuration). every element want to be in stable state. Therefore although second ionisation energy is almost double than first ionisation energy the alkaline earth metal always form divalent cation.

hope it helps ☺