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9.5 - for the ionic solids that are made of ions with low...

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Key: 5. What ionic compound has the smallest lattice energy? a. sodium iodide b. potassium fluoride c. potassium iodide d. lithium chloride e. lithium bromide f.. sulfur dioxide Lattice energy is the energy required to separate the ions in an ionic solid. We therefore need to determine which solid would be easiest to separate. Since sulfur dioxide is not an ionic solid, we can eliminate it right off the bat. There are two main factors that make ionic species hold together tightly, namely charge and size . Charge plays more of a factor and should thus be considered first. If the ions in an ionic solid have a high charge they are bound strongly like two strong magnets. We should therefore look
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Unformatted text preview: for the ionic solids that are made of ions with low charge (giving low lattice energy). It turns out that in this problem all of the ions involved have a +1 or -1 charge, so we must next consider size. If the ions in an ionic species are small, then they can get closer to one another giving a stronger attraction. We should therefore look for the ionic solid that is made of the largest ions, because we are looking for compound with the least amount of lattice energy. Potassium iodide has the two largest ions and would thus be easiest to pull apart, or in other words, have the smallest lattice energy....
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