Question

What is electron affinity?

Answer 1

Affinity means love 
hence , electron affinity is simply love for electrons 

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

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Answer 2

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