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AP Chemistry
2.3 Structure of Ionic Solids
AdvancedMCQMathematicalConceptual20.4k
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.

IonIonic 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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