Question

what is electron affinity.write its variation in periodic table​

Answer 1

The electron affinity of an atom  is defined as the amount of energy released or spent when an electron is added to a neutral atom  in the gaseous state to form a negative ion

Increases along the period

Decreases down the group

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Answer 2

Answer:

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.J