We are being asked to identify which ionic compound has the **highest lattice energy**. To estimate the lattice energy (or ionic bond energy) of an ionic compound, we will use the following equation:

$\overline{){\mathbf{I}}{\mathbf{o}}{\mathbf{n}}{\mathbf{i}}{\mathbf{c}}{\mathbf{}}{\mathbf{B}}{\mathbf{o}}{\mathbf{n}}{\mathbf{d}}{\mathbf{}}{\mathbf{E}}{\mathbf{n}}{\mathbf{e}}{\mathbf{r}}{\mathbf{g}}{\mathbf{y}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\left|\mathbf{c}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{o}\mathbf{n}\mathbf{}\mathbf{c}\mathbf{h}\mathbf{a}\mathbf{r}\mathbf{g}\mathbf{e}\mathbf{}\mathbf{\xb7}\mathbf{a}\mathbf{n}\mathbf{i}\mathbf{o}\mathbf{n}\mathbf{}\mathbf{c}\mathbf{h}\mathbf{a}\mathbf{r}\mathbf{g}\mathbf{e}\right|}{\mathbf{c}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{o}\mathbf{n}\mathbf{}\mathbf{r}\mathbf{a}\mathbf{d}\mathbf{i}\mathbf{u}\mathbf{s}\mathbf{}\mathbf{+}\mathbf{}\mathbf{a}\mathbf{n}\mathbf{i}\mathbf{o}\mathbf{n}\mathbf{}\mathbf{r}\mathbf{a}\mathbf{d}\mathbf{i}\mathbf{u}\mathbf{s}}}$

Radius = period number

• To determine the cation and anion charge, recall that some elements have common charges based on what **group** they belong to on the periodic table:

Which of these ionic solids would have the *largest *magnitude lattice energy?

A. KF B. CaBr_{2} C. NaF D. MgO E. CaI_{2}

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