Question

Explain the following :-(1) Mgztion is smaller
than the eve o 2-ion though both are
iso electronic. lil Alkali metal does not form
dipositive ions. The co gain enthalpy of
noble gases is positive? iv) The second
electroð gain enthalpy of halogens are
zero u out of Nat and we which
has higher jonization enthalpy.​

Answer 1

Answer:

Mg2+ ion is smaller than O2- ion though both are iso-electronic. The nuclear charge in Mg2+ is + 12 and O2- is + 8, so with the increase in nuclear charge the size decreases and, hence O2- > Mg2+.