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AP Chemistry
2.3 Structure of Ionic Solids
2.2 Intramolecular Force and Potential Energy
AdvancedMCQGraphicalConceptual21.5k
Potential energy as a function of internuclear distance for isolated gaseous ion pairs.
Potential energy as a function of internuclear distance for isolated gaseous ion pairs.
The potential energy curve for the interaction between isolated gaseous \(\text{Na}^+\) and \(\text{Cl}^-\) ions as a function of internuclear distance is represented by the solid curve in the graph above. A student predicts how substituting \(\text{K}^+\) in place of \(\text{Na}^+\) alters this curve. Which of the labeled curves best represents the potential energy curve for the interaction between isolated gaseous \(\text{K}^+\) and \(\text{Cl}^-\) ions, and what is the correct justification?

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