The oxides having number of oxygen atoms per atom is found to be 3÷2 = 1.5 . It may be ionic, covalent, or mixed oxide.
Examples:
(1) Covalent: B2O3, N2O3
(2) Ionic: Al2O3, Fe2O3
(3) Mixed: Pb2O3 (PbO +PbO2)Related Questions:
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