Explain why the electron gain enthalpy

Question:

Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

Solution:

Fluorine has a smaller size as compared to chlorine as a result of which the attraction outside the shell to gain electron is less. Moreover, there are inter electronic

repulsions as well in the 2p orbitals which results in the less negative electron gain enthalpy.

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