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Trend in Electron Affinity

Arrange the f...

Question

Arrange the following as per the instructions given in the brackets:
$C l, F, B r, I$ (increasing order of electron affinity)

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Solution

On moving down the group as the atomic size increases, electron affinity decreases.
Greater the electron affinity more electronegative is the element.
The order is: $I < B r < C l < F$

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