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AP Chemistry
2.2 Intramolecular Force and Potential Energy
AdvancedMCQGraphicalMathematicalConceptual21.8k
Potential-energy curves for the halogen dimers
Potential-energy curves for the halogen dimers
A student models the bond energetics of \(\text{F}_2\), \(\text{Cl}_2\), and \(\text{Br}_2\) using the potential-energy curves shown. The zero of potential energy represents completely separated atoms. The covalent radii increase in the order \(\text{F}<\text{Cl}<\text{Br}\), and the depth of a curve’s minimum below zero corresponds to the bond dissociation energy.

Which choice correctly assigns the curves and explains why the curve with the shortest equilibrium bond does not have the greatest bond dissociation energy?

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