question: What compounds form crystals instead of molecules?
distractor3: magnetic compounds
distractor1: metallic compounds
distractor2: soluble compounds
correct_answer: ionic compounds
support: Ionic compounds form crystals instead of molecules. Ionic bonds are strong and the crystals are rigid. As a result, ionic compounds are brittle solids with high melting and boiling points. In the liquid state or dissolved in water, ionic compounds are good conductors of electricity.