The document discusses different types of chemical bonds: 1) Ionic bonds form between positive and negative ions through electrostatic attraction. For example, sodium chloride forms when sodium cations and chloride anions are attracted. 2) Covalent bonds form when atoms share electrons to achieve stable outer energy levels. Atoms that are unlikely to gain or lose electrons form covalent bonds. Molecules are formed when atoms share electrons to become neutral. 3) Metallic bonds involve the sea of electrons that bind metallic atoms together in a lattice structure.