Explain three factors which influence the electron affinity (Electron Gain Enthalpy)

Electron affinity is

Explain the factors influencing rate of reaction.

Electron affinity involves :

Electron gain enthalpy values

Which element has least electron affinity?

Electron affinity is measured in

Explain the trends in ionisation potential, electron affinity, electronegativity and metallic nature of halogens.

Write short note on electron affinity.