The order of first electron affinity of $O, S$ and $S e$ is:

O > S > S e

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S > S e > O

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S e > O > S

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S > O > S e

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Solution

The correct option is D $S > S e > O$
O has an exceptionally smaller value of electron affinity $(- 141 k J m o l^{- 1})$ due to smaller atomic size than sulphur (weaker electron-electron repulsion in 3p-subshell). It is less than Se and Te also.

$S > S e > O$

Thus, Option B is correct.

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