Which of the following pairs of elements would have a more negative electron gain enthalpy ? (i) O or F, (ii) F or Cl

[prasanna]

(i) F (- 328 kJ mol-1) has more negative electron gain enthalpy than O (- 141 kJ ${{mol}^{-1}}$).
(ii) Cl (- 349 kJ ${{mol}^{-1}}$) has more negative electron gain enthalpy than F (- 328 kJ ${{mol}^{-1}}$).