Problem Solving

In the ionic compounds LiF, NaCl, KBr, and RbI, the measured cation–anion distances are 2.01 Å (Li–F), 2.82

Å (Na-Cl), 3.30 Å (K–Br), and 3.67 Å (Rb–I), respectively.

1. Predict the cation–anion distance using the values of ionic radii given in Figure 7.7, on page 257 in the textbook.

2. Calculate the difference between the experimentally measured ion–ion distances and the ones predicted

from Figure 7.7. Assuming we have an accuracy of 0.04 Å in the measurement, would you say that the two sets

of ion–ion distances are the same or not? Why, or why not?

3. What estimates of the cation–anion distance would you obtain for these four compounds using bonding

atomic radii? Are these estimates as accurate as the estimates using ionic radii? Explain your answer.

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