Which of the following are isoelectronic species i.e. those having the same number of electron $C a^{+ 2}, S^{- 2}$ ?

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Solution

Both are isoelectronic species because no. of electrons in $C a^{2 +} = 18$
and $S^{- 2} = 18.$ $(∴ 18 e l e c t r o n s e a c h)$

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