Which one among the following ions, is smallest in size

Question

Which one among the following ions, is smallest in size (A) N3 - (B) O2 - (C) F- (D) Na+

Tardigrade Admin · Accepted Answer

Na+ < F- < O2 - < N3 - , All are isoelectronic species, hence effective number charge is highest for Na+ so, it has smallest size among the given ions. Size of ion is inversely proportional to effective nuclear charge.

Q. Which one among the following ions, is smallest in size

$N^{3 -}$

$O^{2 -}$

$F^{-}$

$N a^{+}$

$N a^{+} < F^{-} < O^{2 -} < N^{3 -}$ , All are isoelectronic species, hence effective number charge is highest for $N a^{+}$ so, it has smallest size among the given ions.
Size of ion is inversely proportional to effective nuclear charge.