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Question

Considering the elements F, Cl, O and N, the correct order of their electron affinity values is:

A
F>Cl>O>S
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B
F>O>Cl>S
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C
Cl>F>S>O
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D
O>F>S>Cl
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Solution

The correct option is B Cl>F>S>O
On moving left to right in a period electron affinity increases due to increase in electronegativity (tendency to attract electron) and on moving down, as the atomic radii increases, therefore electron affinity decreases.
So from the element F, Cl, O, S
The size of Cl is having highest electron affinity value than F as the size of F being small and highly electronegative,it tends to repel the incoming electron hence has low affinity than Cl but have a higher affinity value than S as sulphur has a large atomic radius compared to Cl but O having more electronegativity tends to repel the incoming electron hence has high electron affinity than O. Hence the order will be :
Cl>F>S>O

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