Chemistry - Complete Pblock- Question with Solution | TestHub

The group 14 elements A and B have the first ionisation enthalpy values of $708$ and $715\mathrm{kJ}{\mathrm{mol}}^{-1}$ respectively. The above values are lowest among their group members. The nature of their ions ${\mathrm{A}}^{2+}$ ${\mathrm{B}}^{4+}$ respectively is