Questions

Which one of the following sets of ions represents the collection of isoelectronic species?

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K^{+}, {Ca}^{2 +}, {Sc}^{3 +}, {Cl}^{-}

{Na}^{+}, {Ca}^{2 +}, {Sc}^{3 +}, F^{-}

K^{+}, {Cl}^{2 -}, {Mg}^{2 +}, {Sc}^{3 +}

{Na}^{+}, {Mg}^{2 +}, {Al}^{3 +}, {Cl}^{-}

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detailed solution

Correct option is A

The isoelectronic species have the same number of electrons. Each of the species $K^{+}, {Ca}^{2 +}, {Sc}^{3 +}$ and ${Cl}^{-}$ has the same number (=18) of electrons.

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