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Q. The element having highest electron affinity

Bihar CECEBihar CECE 2007Classification of Elements and Periodicity in Properties

Solution:

Halogens have highest electron affinity in the periodic table and it decreases down the group. Chlorine has highest electron affinity and fluorine has lower electron affinity. Than chlorine due to its small size and repulsion between electrons present in it and added electron. The order of electron affinity is
$ F < Cl > Br > I $