Question

Explain why group 2 elements never form M3+ ion

Answer 1

Explanation:

it is because when they donate the second electron they get stable and attain the noble gas configuration and for ex Mg

Mg→Mg^+. +1e`

Mg^+→ Mg^2+ +1e`

here by now Mg has attain the noble gas configuration by donating 2e` so then to remove the 3e` the Ionisation energy will be more as there is more nuclear charge holding electron