• # question_answer The smallest among the following ions is [JIPMER 1999] A) $N{{a}^{+}}$ B) $M{{g}^{+2}}$ C) $B{{a}^{2+}}$ 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.