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Question

For electron affinity of halogens which of the following is correct?
  1. Br>F
  2. F>Cl
  3. Br<Cl
  4. F>I

A
Br>F
B
F>Cl
C
Br<Cl
D
F>I
Solution
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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 F>Cl>Br>I
However, it is not so. The electron affinity of elements of III period is higher than that of II period because elements of II period have a small size and greater electron density so the incoming electrons suffer a repulsive force. Thus the order of electron affinity is Cl>F>Br>I.

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