The lattice energy can be estimated using:
K+ is from Period 4 with a charge of +1 while Cl– is from Period 3 with a charge of –1.
The lattice energy of KCl is:
Rb+ is from Period 5 with a charge of +1 while Br– is from Period 4 with a charge of –1.
The lattice energy of RbBr is:
Arrange these compounds in order of increasing magnitude of lattice energy: KCl, SrO, RbBr, CaO.
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