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NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions.
(a) The lattice energies of NaCl and KF are given in Table. Based on the lattice energies, would you expect the Na-Cl or the K-F distance to be longer?
(b) Use the ionic radii given in Figure to estimate the Na-Cl and K-F distances. Does this estimate agree with the prediction you made based on the lattice energies?
TABLE 8.2
- Lattice Energies
Lattice Energy fld/rnol)
for Some Ionic Compound
Compounds
Lattice Energy (10/mol)
Compound
LiF
1030
MgCJ2
2326
LiCI
834
Sick
2127
Lil
730
VF
910
MgO
3795
Na(]
788
CaO
3114
NaBr
732
Sr0
3217
Nal
682
ICE
808
ScN
7547
KCI
701
KBr
671
CACI
657
Cs1
600
Why are the Kr---Kr and intermolecular Br---Br distances in the solid form of the two elements practically identical. How would you expect the Br---Br distances in solid CBr4 to be related to the above distances
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