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- An ionic compoundA compound containing oppositely charged ions held together by electrostatic attraction. Usually the ions are in a crystal lattice with positive ions surrounded by negative ions and negative ions surrounded by positive ions. that can be formed by replacing the hydrogen ionAn atom or covalently bonded set of atoms that carries an overall net charge. of an acidIn Arrhenius theory, a substance that produces hydrogen ions (hydronium ions) in aqueous solution. In Bronsted-Lowry theory, a hydrogen-ion (proton) donor. In Lewis theory, a species that accepts a pair of electrons to form a covalent bond. with a different cationA positively charged ion, attracted toward the cathode in an electrolytic cell..