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

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

$N^{3 -}, O^{2 -}, F^{-}, S^{2 -}$

${Li}^{+}, {Na}^{+}, {Mg}^{2 +}, {Ca}^{2 +}$

${Ba}^{2 +}, {Sr}^{2 +}, K^{+}, {Ca}^{2 +}$

answer is B.

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Detailed Solution

$_{19} K^{+},_{17} {Cl}^{-},_{20} {Ca}^{2 +}$ and $_{21} {Sc}^{3 +}$ have the same number of 18 electrons.

Thus option B represents a collection of isoelectronic species.

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