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In the ionic compounds LiF, NaCl, KBr, and RbI, the measured
cation–anion distances are 201 pm (Li–F), 282 pm
(Na–Cl), 330 pm (K–Br), and 367 pm (Rb–I), respectively. (c) What estimates of the cation–
anion distance would you obtain for these four compounds
using neutral atom bonding atomic radii? Are these estimates
as accurate as the estimates using ionic radii?