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(A) The correct order of electron affinity is $Cl > F > S > O$.Due to the small size of $2^{nd}$ period elements ($F$ and $O$),the incoming electron e

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$Cl > F > S > O$

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(A) The correct order of electron affinity is $Cl > F > S > O$.Due to the small size of $2^{nd}$ period elements ($F$ and $O$),the incoming electron experiences greater inter-electronic repulsion compared to the $3^{rd}$ period elements ($Cl$ and $S$).Consequently,the electron affinity of $2^{nd}$ period non-metals is lower than that of their respective $3^{rd}$ period counterparts.

Which of the following represents the correct order of electron affinity?

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