Question

For $N^{3-}>O^{2-}>F^{-}andN{a}^{+},$ the order in which their ionic radii varies is

• A. $N^{3-}>O^{2-}>F->N{a}^{+}$
• B. $N^{2-}>N{a}^{+}>O^{2-}>F-$
• C. $N{a}^{+}>O^{2-}>N^{3-}>F-$
• D. $O^{2-}>F->N{a}^{+}>N^{3-}$

Answer 1

Answer: (A)

$N^{3-},O^{2-},F-$ and $N{a}^{+}$ are all isoelectronic species. As the atomic number increases, nuclear attraction increases, hence the order of ionic radii
$N^{3-}>O^{2-}>F->N{a}^{+}$