Which one of the elements has the maximum electron affinity?

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Solution

The correct option is B
Cl

Usually, smaller the size of an atom, stronger is the pull on the incoming electron.
Order of atomic radius for halogens is:
I > Br > Cl > F
So, the order of electron affinity should be:
F > Cl > Br > I
But, fluorine being small in size, experiences strong electronic repulsion. And utilises some energy to overcome these. Hence, the addition of an electron to fluorine is less favorable than that in the case of chlorine.
Therefore, the correct order is:
Cl > F > Br > I

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