Question

Explain the following phenomena. why Fluorine has lower electron affinity than chlorine​

Answer 1

Fluorine ,through higher than chlorine in the periodic table,has a very small atomic size.This makes the fluoride anion so formed unstable(Highley reactive) due to very high charge/mass/ratio. ...As a result,fluorine has an electron affinity less than that of Chlorine.

Answer 2

Electron affinity for fluorine is than chlorine most likely , due to the electron repulsion that occur between the electron where n= 2 . the elements in the second period have such small electron clouds that electron repulsion is greater than that of the rest of the family.