Question

How does electron affinity vary along a period or down a group?

Answer 1

electron affinity rreduces across a period and increases down a group .

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Answer 2

The less valence electrons an atom has, the least likely it will gain electrons. Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull.