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Oxide

For negatively-charged polyatomic ion containing oxygen, see Oxyanions.
The unit cell of rutile, an important oxide of titanium. Ti(IV) centers are grey; oxygen centers are red. Notice that oxygen forms three bonds to titanium and titanium forms six bonds to oxygen.

An oxide (/ˈɒksaɪd/) is a chemical compound containing at least one oxygen atom and one other element[1] in its chemical formula. "Oxide" itself is the dianion (anion bearing a net charge of −2) of oxygen, an O2− ion with oxygen in the oxidation state of −2. Most of the Earth's crust consists of oxides. 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 oxidation.[2]

  1. ^ Hein, Morris; Arena, Susan (2006). Foundations of College Chemistry (12th ed.). Wiley. ISBN 978-0-471-74153-4.
  2. ^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.

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