Most elements form oxides of more than one stoichiometry. Oxides are extraordinarily diverse in terms of stoichiometries (the measurable relationship between reactants and chemical equations of an equation or reaction) and in terms of the structures of each stoichiometry. For example, aluminium foil develops a thin skin of Al 2O 3 (called a passivation layer) that protects the foil from further oxidation. Even materials considered pure elements often develop an oxide coating. Most of the Earth's crust consists of oxides. "Oxide" itself is the dianion (anion bearing a net charge of –2) of oxygen, an O 2– ion with oxygen in the oxidation state of −2. Notice that oxygen forms three bonds to titanium and titanium forms six bonds to oxygen.Īn oxide ( / ˈ ɒ k s aɪ d/) is a chemical compound containing at least one oxygen atom and one other element in its chemical formula. Ti(IV) centers are grey oxygen centers are red. The unit cell of rutile, an important oxide of titanium. For negatively-charged polyatomic ion containing oxygen, see Oxyanions.
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