Which Of The Following Have Highest Electron Affinity?

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Question

Which of the following have highest electron affinity?

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Solution

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The electron affinities of some of the elements of second period (ie, N, O, F, etc) are however, lower than the corresponding elements (ie, P, S, Cl, etc) of the third period. This is due to the reason that the elements of second period have the smallest atomic size amongst the elements in their respective groups. As a result, there are considerable electron-electron repulsion within the atom itself and hence, the additional electron in not accepted with the same ease as is the case with the remaining elements in the same group.