Electron gain enthalpy generally becomes more negative across a period and up a group. However, due to electron-electron repulsion in small atoms, Fluorine has a less negative electron gain enthalpy than Chlorine.
Electron gain enthalpy of halogens follows, the order
Asked in Co operative Supervisor & Environment Supervisor (Group C) Exam 2023 · Topic: Sulphur, Nitrogen, Halogen, Inert Gases (Halogens (F, Cl, Br, I): General characteristics, trends in physical and chemical properties, and oxidation states)
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Answer: A. Cl $>$ F $>$ Br $>$ I
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