Statement-1: ${\mathrm{Na}}^{+}$and ${\mathrm{Al}}^{3+}$are isoelectronic but the magnitude of ionic radius or ${\mathrm{Al}}^{3+}$is less than that of ${\mathrm{Na}}^{+}$.

Statement-2: The magnitude of effective nuclear charge of the outer most shell electrons in ${\mathrm{Al}}^{3+}$is greater than that in ${\mathrm{Na}}^{+}$,

Statement-1 is True, Statement-2 is False.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.

 

Statement-1 is False, Statement-2 is True.