Question

Disscuss briefly the factor affecting electron affinity

Answer 1

greater the nuclear charge greater will be the attraction for the incoming electron and as a result larger  will be the value of electron affinity larger the size of an atom larger will be the distance between the nucleus and incoming electron

Answer 2

Electron affinity is the tendency of an atom to pull electrons towards itself (sort of electronegativity). In general, atoms with higher attractive forces tend to pull electrons more, I. e, more nuclear charge, however it is not the only factor (as Fluorine has only 9 protons and yet has a strong affinity to electrons ). So, more specifically, an atom having high charge density ie, charge per unit volume has high affinity to electrons.