The process requiring absorption of energy is

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(A) The process of adding an electron to a neutral gaseous atom is called electron gain enthalpy. For most non-metals,this process is exothermic (rele

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$N 	o N^{-}$

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(A) The process of adding an electron to a neutral gaseous atom is called electron gain enthalpy. For most non-metals,this process is exothermic (releases energy). However,for Nitrogen $(N)$,the process $N + e^- 	o N^-$ is endothermic (requires absorption of energy). This is because Nitrogen has a stable half-filled $2p^3$ electronic configuration,and the incoming electron experiences significant inter-electronic repulsion due to the small size of the atom. Therefore,the correct option is $A$.

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