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Q.

Which of the following halogens has the highest electron affinity?

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a

Cl

b

Br

c

I

d

F

answer is B.

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Detailed Solution

  • As moving down the group electron affinity of elements decreases.
  • But in case of Fluorine, it is a small atom with a small amount of space available in its 2p orbital. 
  • Because of this, any new electron trying to attach to fluorine experiences lower electron affinity from the electrons already present in the element's 2p orbital.
  • Since chlorine's outermost orbital is a 3p orbital, there is more space, and the electrons in this orbital are inclined to share this space with an extra electron.
  • Therefore, chlorine has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.
  • Hence, electron affinity of Chlorine is higher in halogens.
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