From the ionic radii given in Figure 7.7, calculate the potential energy of a Ca2+ and O...

From the ionic radii given in Figure 7.7, calculate the potential energy of a Ca²⁺ and O^2- ion pair that is just touching (the magnitude of the electronic charge is given on the back inside cover). Calculate the energy of a mole of such pairs. How does this value compare with the lattice energy of CaO (Table 8.2)? Explain the difference.

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