Students taking physics A level learn that the electrostatic force between two charged particles is proportional to

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Students taking physics A level learn that the electrostatic force between two charged particles is proportional to

where Q1 and Q2 are the charges on the particlesand r is the distance between the centres of the particles. Use this relationship to explain why:

a. Magnesium oxide has a greater lattice energy than lithium fluoride

b. Lithium fluoride has a greater lattice energy than potassium bromide.

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