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

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.