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Ionic compounds are chemical compounds composed of ions, which are atoms or molecules that have lost or gained electrons. These compounds are typically formed when a metal loses one or more electrons to a nonmetal. The resulting positive ion (cation) is attracted to the negative ion (anion), forming an ionic bond. Ionic compounds are usually solids at room temperature and have high melting and boiling points. They are also good conductors of electricity when dissolved in water or melted.