Juxtapose atomic size, comparing cation to cation and anion to anion between compounds. If the charges of multiple compounds are the same or too similar in value to produce distinctions, consider the sizes of the ions. For example, a calculated charge of -3 has 3 times the magnitude of a calculated charge of -1 this would denote that the ionic compound with the charge of -3 exhibits a much higher lattice energy than the ionic compound with the -1 charge (roughly 3 times as high).ģ. If the charge discrepancies between compounds do not seem clear, calculate Q 1 x Q 2 for each compound and compare those values. First look at the relative charges displayed by each ion in a given compound-if one compound has much higher ionic charges, then it will likely have the higher lattice energy.Ģ.
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