Which of the following is not isoelectronic [MP PET 2002]

1.	Which of the following is not isoelectronic [MP PET 2002]
A.	\[N{{a}^{+}}\]
B.	\[M{{g}^{2+}}\]
C.	\[{{O}^{2-}}\]
D.	\[C{{l}^{-}}\]
Answer» E.

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