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Q.
Which of the following has a positive value of electron gain enthalpy?
Classification of Elements and Periodicity in Properties
Solution:
Electron gain enthalpy of nitrogen is $+31 \,kJ / mol$. Due to smaller size, there are inter electronic repulsions, and also extra stability due to exactly half filled configuration $\left(2 p^{3}\right)$, it is difficult for an electron to enter the shell.