MCQ
Which of the following have high electron affinity
- A$F$
- ✓$Cl$
- C$N$
- D$O$
✓
Answer
Correct option: B.
$Cl$
b
(b) The electron affinities of some of the elements of second period (i.e., $N,\,O,\,F$ etc.) are however, lower than the corresponding elements (i.e., $P, S, Cl,$ etc.) of the third period.
(b) The electron affinities of some of the elements of second period (i.e., $N,\,O,\,F$ etc.) are however, lower than the corresponding elements (i.e., $P, S, Cl,$ 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 is not accepted with the same ease as is the case with the remaining elements in the same group.
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