The process requiring absorption of energy is

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(A) The process of adding an electron to a neutral atom to form an anion is known as electron gain enthalpy. For most non-metals,energy is released du

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$N 	o N^{-}$

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(A) The process of adding an electron to a neutral atom to form an anion is known as electron gain enthalpy. For most non-metals,energy is released during this process (exothermic),meaning electron gain enthalpy is negative. However,for Nitrogen $(N)$,the electronic configuration is $1s^2 2s^2 2p^3$. Since the $2p$ subshell is exactly half-filled,it is relatively stable. Adding an electron to the $2p$ orbital of Nitrogen requires energy to overcome the inter-electronic repulsion and the stability of the half-filled configuration,making the process endothermic. Thus,the process $N 	o N^{-}$ requires the absorption of energy.

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