STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Assertion $(A):$ The ionic radii of $O ^{2-}$ and $Mg ^{2+}$ are same.

Reason $( R )$ : Both $O ^{2-}$ and $Mg ^{2+}$ are isoelectronic species.

In the light of the above statements, choose the correct answer from the options given below

$N{O_2}$,              $S{F_4}$ ,          $PF_6^ - $