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

N^3- , O^2- , F^- , S^2-

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Li⁺ , Na⁺ , Mg²⁺ , Ca²⁺

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K⁺ , CI^-, Ca²⁺, Sc³⁺

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Ba²⁺ , Sr²⁺ , K⁺, ca²⁺

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Solution

The correct option is C
K⁺ , CI^-, Ca²⁺, Sc³⁺

(a) $a^{3}$ = 7 + 3 = 10 e ; $O^{-}$ $\to$ 8 + 2 = 10 $e^{-}$

$F^{-}$ = 9 + 1 = 10 $e^{-}$ ; $S^{+}$ $\to$ 16 + 2 = 18 $e^{-}$ (not iso electronic)

(B) ${L i}^{+}$ = 3 + 1 = 4 $e^{-}$ ; ${N a}^{+}$ = 11 - 1 = 10 $e^{-}$ ;

${M g}^{+ +}$ = 12 - 2 = 10 $e^{-}$

${C a}^{+ +}$ = 20 - 2 = 18 e,(isoelectronic)

(c) $K^{+}$ = 19 - 1 = 18 $e^{-}$ , ${C l}^{-}$ = 17 + 1 $e^{-}$

${C a}^{+ +}$ = 20 - 2 = 18e , ${S c}^{3 +}$ = 21 - 3 = 18 $e^{-}$ (isoelectronics)

(d) ${B a}^{+}$ = 56 - 2 = 54e , ${S r}^{+ +}$ = 38-2 = 36 $e^{-}$

$K^{+}$ = 9 - 1 = 18 $e^{-}$ , ${C a}^{+ +}$ = 20 - 2 = 18 $e^{-}$ (not isoelectronic)

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