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F2 has lower bond dissociation enthalpy than Cl2. Why? - Chemistry

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F2 has lower bond dissociation enthalpy than Cl2. Why?

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Solution

The size of a fluorine atom is very small as compared to a chlorine atom. Therefore, the repulsion between electrons in the outer most shell of the two atoms in a fluorine molecule is much greater than that in a chlorine molecule. Hence, it requires less energy to break up the fluorine molecule, making its bond dissociation energy lesser than that of chlorine molecule.

Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
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