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 \[M{{g}^{2+}}\] \[N{{a}^{+}}\] \[Ne\] \[{{O}^{2-}}\] No. of electron \[10\] \[10\] \[10\] \[10\] Nuclear charge \[+12\] \[+11\] \[+10\] \[+8\] \[\therefore \] \[M{{g}^{2+}}<N{{a}^{+}}<Ne<{{O}^{2-}}\] \[\therefore \] \[M{{g}^{2+}}\]has smallest size.
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