Which one of the following represents all isoelectronic species? [2023]

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Solution

Q.
Which one of the following represents all isoelectronic species [2023]

1 ${Na}^{+}, {Cl}^{-}, O^{-}, {NO}^{+}$

2 $N_{2} O, N_{2} O_{4}, {NO}^{+}, NO$

3 ${Na}^{+}, {Mg}^{2 +}, O^{-}, F^{-}$

4 ${Ca}^{2 +}, Ar, K^{+}, {Cl}^{-}$

Ans.
(4)

Total number of electrons are same in all the species as follows:
${Ca}^{2 +}, Ar, K^{+}, {Cl}^{-} \to 18 electrons$

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