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Question 6.6: LATTICE ENERGIES Which of the following alkali metal halides...

LATTICE ENERGIES

Which of the following alkali metal halides has the larger lattice energy, and which has the smaller lattice energy? Explain.

STRATEGY
The magnitude of a lattice energy depends directly on the charge on the ions and inversely on the distance between ions (that is, on the radii of the ions). In this instance, all the ions in both drawings are singly charged, so only the size of the ions is important.

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The ions in drawing (b) are smaller than those in drawing (a), so (b) has the larger lattice energy

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