A) \[M{{g}^{2+}}\]
B) \[N{{a}^{+}}\]
C) \[B{{a}^{2+}}\]
D) \[A{{l}^{3+}}\]
Correct Answer: D
Solution :
As we move from left to right in a period, the atomic size of elements decrease, hence among Na, Mg and Al, Al will be smallest. Further atomic size decrease with increase in oxidation number. Hence \[A{{l}^{3+}}\] ion is quite smaller than other three ions as it has maximum positive charge (+ 3).
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