The interionic distances of several alkali halide crystals are as follows:
Crystal NaCl | NaBr | NaI | KCl | KBr | KI |
Interionic 282 distance (pm) | 299 | 324 | 315 | 330 | 353 |
Plot lattice energy versus the reciprocal interionic distance. How would you explain the plot in terms of the dependence of lattice energy on the distance of separation between ions? What law governs this interaction? (For lattice energies, see Table 5.1.)
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