Aluminum metal is produced by heating aluminum oxide, Al2O3(s), and other substances to almost 1000 °C until the mixture melts. Molten aluminum oxide is an excellent conductor. An electric current passed through liquid aluminum oxide can provide the electrons needed to convert the aluminum ions to neutral metal atoms. Explain the following properties of aluminum oxide in terms of ionic bonding: K/U (a) its high electrical conductivity when molten (b) its high melting point

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