S has more negative electron gain enthalpy than O why ?

Out of O and S which has higher negative electron gain enthalpy and why ?

Out of O^(-) and O , which has more negative electron gain enthalpy?

Name a halogen which has more negative electron gain enthalpy value?

Which in each pair of elements has a more negative electron gain enthalpy? (a) O or F

Which of the following pairs would have more negative electron gain enthalpy ? O or F

a) On moving down a group what happens to electron gain enthalpy? b) Why chlorine shows more negative electron gain enthalpy than fluorine?