p-Block elementsMedium
Question
For electron affinity of halogens which of the following is correct ?
Options
A.Br > F
B.F > Cl
C.Br > Cl
D.F > I
Solution
Electron affinity decreases in a group from top to bottom due to increase in group fromtop to bottom due to increase in size, so the expected order of electron affinity for halogens is
F > Cl > Br > I
However, it is not so. The electron affinity of elements of III period is higher than thatof II period because elements of II period have small size and greater electrons suffer a repulsive force. Thus the order of electron affinity is
Cl > F > Br > I.
F > Cl > Br > I
However, it is not so. The electron affinity of elements of III period is higher than thatof II period because elements of II period have small size and greater electrons suffer a repulsive force. Thus the order of electron affinity is
Cl > F > Br > I.
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