Calculate the potential energy of attraction between the Na⁺ and Cl^? ions at the equilibrium separation r₀ = 0.236 nm and compare this result with the dissociation energy given in Figure. What is the energy due to repulsion of the ions at the equilibrium separation?

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U(r), ev 3 2 Na'+ CI" }1.52 ev Na + CI 0.2 0.4 06-f 0.8 1.0 1.2 14 1.6 1, nm Dissociation energy 4.27 ev = 0.236 nm