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In the ionic compounds LiF, NaCl, KBr, and RbI, the measured cation-anion distances are 2.01 Å (Li—F), 2.82 Å(Na-CI), 3.30 Å (K-Br), and 3.67 Å (Rb-l), respectively.(a) Predict the cation—anion distance using the values of ionic radii given in Figure 7.8. (b) Calculate the difference between the experimentally measured ion—ion distances and the onespredicted from Figure 7.8. Assuming we have an accuracy of0.04 Å in the measurement, would you say that the two sets of ion—ion distances are the same or not? (c) What estimates of the cation—anion distance would you obtain for these fourcompounds using bonding atomic radii? Are these estimates as accurate as the estimates using ionic radii?
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Chemistry: The Central Science, Books a la Carte Edition (13th Edition)
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