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  4. Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

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Q. Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

NTA AbhyasNTA Abhyas 2022

Solution:

Here electron gain enthalpy follows the order Cl > F > S > O.
The value is less in case of F and O- atoms due to their smaller sizes and more electronic density, there is $e^{-}-e^{-}$ repulsion which makes addition of $e^{-}$ difficult.