Question

Which one of the following is the smallest in size?

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

Answer 1

The correct option is D

$N{a}^{+}$

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