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Trend in electron affinity of halogens

Answer Text:
Trend in electron affinity of halogens:
- Generally the electron affinity of halogens decreases down the group.
Reason:
- The size of the atoms increases (due to increasing number of energy levels) down the group and thus the force of attraction of the electrons in the outermost energy level towards the nucleus decreases.
- Thus down the group the ease with which electrons are gained decreases and the faster the ease of electron gain, the more the energy released hence the more the electron affinity.