A) \[N{{a}^{+}}\]
B) \[M{{g}^{+2}}\]
C) \[B{{a}^{2+}}\]
D) \[A{{l}^{3+}}\]
Correct Answer: D
Solution :
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.
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