AP Chemistry
2.3 Structure of Ionic Solids
A student investigating the properties of ionic solids compiles the experimental data shown in the table below.
Which of the following statements correctly compares the lattice energies of \(\text{MgO(s)}\) and \(\text{MgF}_2\text{(s)}\) and provides the best justification for the difference in their melting points?
| Compound | Cation | Anion | Interionic distance (\(\text{pm}\)) | Melting point (\(^\circ\text{C}\)) |
|---|---|---|---|---|
| \(\text{MgO}\) | \(\text{Mg}^{2+}\) | \(\text{O}^{2-}\) | \(212\) | \(2852\) |
| \(\text{MgF}_2\) | \(\text{Mg}^{2+}\) | \(\text{F}^-\) | \(199\) | \(1263\) |
Which of the following statements correctly compares the lattice energies of \(\text{MgO(s)}\) and \(\text{MgF}_2\text{(s)}\) and provides the best justification for the difference in their melting points?
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