For electron affinity of halogens which of the following is correct?







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Electron affinity decreases in a group from top to bottom due to increase in size, so the expected order of electron affinity for  halogens is
However, it is not so. The electron affinity of elements of period is higher than that of period because elements of period have a small size and greater electron density so the incoming electrons suffer a repulsive force. Thus the order of electron affinity is .

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