Which of the following group does not represent the isoelectronic species?

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${OH}^{-}, H_{2} O, {NH}_{2}^{-}, F^{-}$

$H_{2} S, K^{+}, Ar, Cl$

${PH}_{3}, {SiH}_{4}, {HS}^{-}, Ar$

${CH}_{4}, H_{2} O, {NH}_{3}, HF$

answer is D.

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Detailed Solution

Atoms and ions with the same number of electrons are referred to as isoelectronic species. Or, an isoelectronic pair is a pair of species with the same amount of electrons that combines all the atoms of a given species. The radii of isoelectronic species might vary due to various nuclear charges.

Here,

The no of electron for $H_{2} S, K^{+}, Ar, Cl$ are 18,18,18 and 17 respectively.

So, $H_{2} S, K^{+}, Ar, Cl$ does not represent the isoelectronic species.

Hence, Option D is correct.

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