AP Chemistry
2.3 Structure of Ionic Solids
A student investigates the lattice energies and melting points of four crystalline ionic compounds: \(\text{MgO}\), \(\text{CaO}\), \(\text{NaF}\), and \(\text{NaCl}\). The ionic radii of the constituent ions are given in the table below.
Based on Coulomb's law and the data provided, which of the following correctly ranks the compounds in order of melting point from greatest to least?
| Ion | Ionic radius (pm) |
|---|---|
| \(\text{Mg}^{2+}\) | \(72\) |
| \(\text{Ca}^{2+}\) | \(100\) |
| \(\text{Na}^{+}\) | \(102\) |
| \(\text{F}^{-}\) | \(133\) |
| \(\text{Cl}^{-}\) | \(181\) |
| \(\text{O}^{2-}\) | \(140\) |
Based on Coulomb's law and the data provided, which of the following correctly ranks the compounds in order of melting point from greatest to least?
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