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what is electron affinity

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the electron affinity of an atom or molecule is defined as the amount of energy released when an extra electron is added to their outer most shell or molecule in a gaseous state to form a negative ion

X + e^{-}\rightarrow X^{-}+energy

generally, the 17th group element has a high electron affinity

Cl> F> Br> I> As

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manish

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Amount of energy released when an electron (e-) is added to isolated gaseous atom. 

For addition of 2nd e- energy is required always i.e. process is endothermic.

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Rachita pandey

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