Question

The smallest among the following ions is

• A. $N{a}^{+}$
• B. $M{g}^{+2}$
• C. $B{a}^{2+}$
• D. $A{l}^{3+}$

Answer 1

The correct option is D

$A{l}^{3+}$

The size of an species decreases with increasing nuclear charge because the attraction for the electrons increases. Thus $A{l}^{3+}$ is smaller in size.