First slide

Electronic configuration and Atomic , physical properties

Question

The electron affinity values(in KJ mole^-1) of three halogens x, y and z are respectively
-349, -333 and -325. Then x, y and z respectively are

Easy

A

F, Cl and Br
B

Cl, F and Br
C

Cl, Br and F
D

Br, Cl and F

Solution

Atomic size increases down the group,so electron affinity decreases.But experimental Order of electron affinity of halogens is, Cl > F > Br > I. It is due to small size and greater repulsion of electrons are responsible for low electron affinity of fluorine than that of chlorine.

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