The electron affinities of O, F, S and Cl are in the order

Options

A. `O lt S lt Cl lt F`
B. `O lt S lt F lt Cl`
C. `S lt O lt Cl lt F`
D. `S lt O lt F lt Cl`

Answer

B

Explanation

The electron affinities(EA) of the representative elements increase from left to right in a period (barring few exceptions) and decrease down the group. However, the members of the second period (e.g., N, O, F), being small, have lower values of EA than those of the third-period members due to the strong repulsions between the incoming electron and the other electrons in the atom.