A) \[N{{a}^{+}}\]
B) \[M{{g}^{+2}}\]
C) \[C{{l}^{-}}\]
D) \[{{F}^{-}}\]
Correct Answer: B
Solution :
As the nuclear charge per \[{{e}^{-}}\] is maximum in \[M{{g}^{+2}}\], it has smallest size among \[N{{a}^{+}},\,\,M{{g}^{+2}},\,\,C{{l}^{-}}\] and \[{{F}^{-}}\].
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