A) \[N{{a}^{+}}\]
B) \[M{{g}^{2+}}\]
C) \[{{O}^{2-}}\]
D) \[C{{l}^{-}}\]
Correct Answer: D
Solution :
Isoelectronic species have same number of electrons.\[M{{g}^{2+}},{{O}^{2-}}\]and\[N{{a}^{+}}\]have 10 electrons hence, these are isoelectronic while \[C{{l}^{-}}\]has 18 electrons hence, it is not isoelectronic.
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