Question

Which one of the following is the smallest in size?

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

Answer 1

Answer: (D)

$Na^+$

Answer 2

Among isoelectronic species, the relation in size is $\, \, \, \,$ cation < neutral < anion Hence, $Na^+$ has smallest size.