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.
. 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?
1.LiF:
The ionic radius of cation Li+= 0.90Å
The ionic radius of anion F-= 1.19Å
Cation-anion distance=0.90Å + 1.19Å= 2.09Å
2.NaCl:
The ionic radius of cation Na+= 1.16 Å
The ionic radius of anion Cl-= 1.67 Å
Cation-anion distance:1.16Å + 1.67Å=2.83Å
3.KBr
The ionic radius of cation K+= 1.52Å
The ionic radius of anion Br-= 1.82Å
Cation-anion distance= 1.52Å + 1.82Å=3.34 Å
4.RbI
The ionic radius of cation Rb+= 1.66Å
The ionic radius of anion I-= 2.06Å
Cation-anion distance= 1.66Å + 2.06Å= 3.72 Å
In the ionic compounds LiF, NaCl, KBr, and RbI, the measured cation–anion distances are 2.01 Å...