A) \[N{{a}^{+}}\]
B) \[M{{g}^{2+}}\]
C) \[Ne\]
D) \[{{O}^{2-}}\]
Correct Answer: B
Solution :
Among isoelectronic species, size decreases with increase in nuclear charge. Hence, the order of size - \[M{{g}^{2+}}<N{{a}^{+}}<Ne<{{O}^{2-}}\]
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