Problem: Arrange these compounds in order of increasing magnitude of lattice energy: KCl, SrO, RbBr, CaO.

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FREE Expert Solution

The lattice energy can be estimated using:


lattice energy=cation charge×anion chargecation period # + anion period #



For KCl: 

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:


lattice energy=+1×-14+3 = 0.143


For RbBr: 

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:

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Problem Details

Arrange these compounds in order of increasing magnitude of lattice energy: KCl, SrO, RbBr, CaO.