Final answer:
Ionic solids have higher melting and boiling points than most molecular solids because of the strong ionic bonds present in ionic compounds.
Step-by-step explanation:
Ionic solids have higher melting and boiling points than most molecular solids due to the strong ionic bonds present in ionic compounds. These bonds are formed between positive and negative ions and are much stronger than the intermolecular forces in molecular compounds. The energy required to break the ionic bonds in an ionic solid is much higher than the energy required to disrupt the intermolecular forces between molecules in a molecular solid, resulting in higher melting and boiling points for ionic compounds.