1.

Which pair is isoelectronic?

A.  Ar and \[Cl\]    
B.         \[\text{N}{{\text{a}}^{+}}\]  and Ne
C.         \[\text{N}{{\text{a}}^{+}}\] and Mg    
D.  Mg and Ne
Answer» C.         \[\text{N}{{\text{a}}^{+}}\] and Mg    


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