Answer
The predictions from ionic radii are correct.
Work Step by Step
From table 8.2, the lattice energies of the four compounds are:
- $LiCl$: 834 kJ/mol
- $KF$: 808 kJ/mol
- $NaCl$: 788 kJ/mol
- $NaBr$: 732 kJ/mol
Therefore, from table 8.2, we can arrange the compounds in decreasing lattice energy as follows: $$LiCl\gt KF\gt NaCl\gt NaBr$$
From part b), we arrange the compounds in decreasing lattice energy as follows: $$LiCl\gt KF\gt NaCl\gt NaBr$$
Comparing 2 results, we can see that the predictions from ionic radii are correct.
