1.

Which of the following is not isoelectronic?

A.  \[\text{N}{{\text{a}}^{+}}\] 
B.  \[M{{g}^{2+}}\]
C.  \[{{\text{O}}^{\text{2}-}}\]    
D.  \[C{{l}^{-}}\]
Answer» D.  \[C{{l}^{-}}\]


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