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Ionic means the elements are joined by connecting with electrons, and everything is molecular. Molecular means something to do with molecules, which is a single compound, which can be carbon dioxide to, zinc oxide. Elements is a single pure element from the Periodic Table, like oxygen,carbon, florine, zinc, iron etc. Compound is a group of these elements bonded through either ionic or covalent bonding. So lactose is just a compound that has joined both ionically and covalently

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16y ago

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