Both ionization energy and electron affinity are opposite processes to each other because of their functions.
The main difference between electron affinity and ionization energy is that electron affinity refers to the amount of energy released when an atom gains an electron while on the other hand, ionization energy is the amount of energy required to remove an outermost electron from an atom.
So we can conclude that both ionization energy and electron affinity are opposite processes to each other because of their functions.
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