Question

Which of the following is smallest in size?

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

Answer 1

The correct option is D $N{a}^{+}$

Among the isoelectronic species, the relation in size is:
$\text{Cation < neutral < anion}$
Hence, $N{a}^{+}$ has smallest size.