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

Question

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl? (A) S < O < Cl < F (B) Cl < F < O < S (C) O < S < F < Cl (D) F < S < O < Cl

Tardigrade Admin · Accepted Answer

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.

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?

S < O < Cl < F

Cl < F < O < S

O < S < F < Cl

F < S < O < Cl

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.

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.