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Which of the following would require least energy?

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$S^{-} (g) \to S (g) + e^{-}$

${Si}^{-} (g) \to Si (g) + e^{-}$

$P - (g) \to P (g) + e^{-}$

${Cl}^{-} (g) \to Cl (g) + e^{-}$

answer is B.

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Detailed Solution

$P^{-}$ features an $3 s^{2} 3 p^{4}$ electrical arrangement on the outside.

Because this species attains the stable half-filled form after losing an electron, removing one electron from it will cost relatively little energy.

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