Question 33

Given below are two statements:
Statement I: Fluorine has most negative electron gain enthalpy in its group.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below.

Statement I: Fluorine has most negative electron gain enthalpy in its group.
- False. Although Fluorine is the most electronegative element, Chlorine actually has the most negative electron gain enthalpy in Group 17. This is because Fluorine's small size leads to significant inter-electronic repulsions when an extra electron is added, making the process less exothermic than in Chlorine.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
- True. In Group 16, Oxygen has the least negative (least exothermic) electron gain enthalpy. Similar to Fluorine, its exceptionally small atomic size creates high electron density, resulting in strong repulsions that resist the addition of a new electron compared to larger atoms like Sulfur.

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