An oxide /ˈɒksaɪd/ is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of −2. Most of the Earth’s crust consists of solid oxides, the result of elements being oxidized by the oxygen in air or in water. Hydrocarbon combustion affords the two principal carbon oxides: carbon monoxide and carbon dioxide. Even materials considered pure elements often develop an oxide coating. For example, aluminium foil develops a thin skin of Al2O3 (called a passivation layer) that protects the foil from further corrosion.

Cerium Oxide   Erbium Oxide   Lanthanum Oxide   Yttrium Oxide   Lutetium Oxide    Samarium Oxide   Scandium Oxide   Terbium Oxide   Thulium Oxide   Ytterbium Oxide   Europium Oxide   Holmium Oxide   Neodymium Oxide   Praseodymium Neodymium Oxide   Praseodymium Oxide    Zirconium Dioxide