The absolute value of the electron gain enthalpy of halogens satisfies :
Solution
The magnitude of electron gain enthalpy of halogen
atoms down the group show abnormal behavior.
The |ΔH<sub>eg</sub>| of F is lower than that of Cl due to its
smaller size. The incoming electron experiences
higher repulsive force due to valence electrons of
F than Cl. The correct order is Cl > F > Br > I.
About this question
Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends
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