Which one of the following is not an iso-elec | vedclass

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(C) Iso-electronic species are those that have the same number of electrons.$1$. For $Mg^{2+}$ ($Z=12$,$12-2=10$ electrons) and $C^{4-}$ ($Z=6$,$6+4=1

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$N^{2-}, O^{2-}$

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(C) Iso-electronic species are those that have the same number of electrons.$1$. For $Mg^{2+}$ ($Z=12$,$12-2=10$ electrons) and $C^{4-}$ ($Z=6$,$6+4=10$ electrons),both have $10$ electrons. Thus,it is an iso-electronic pair.$2$. For $N^{3-}$ ($Z=7$,$7+3=10$ electrons) and $O^{2-}$ ($Z=8$,$8+2=10$ electrons),both have $10$ electrons. Thus,it is an iso-electronic pair.$3$. For $N^{2-}$ ($Z=7$,$7+2=9$ electrons) and $O^{2-}$ ($Z=8$,$8+2=10$ electrons),they have different numbers of electrons ($9$ and $10$). Thus,it is not an iso-electronic pair.$4$. For $F^{-}$ ($Z=9$,$9+1=10$ electrons) and $Al^{3+}$ ($Z=13$,$13-3=10$ electrons),both have $10$ electrons. Thus,it is an iso-electronic pair.Therefore,the correct option is $C$.

Which one of the following is not an iso-electronic pair?

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