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Additional
oxide
English Wikipedia - The Free Encyclopedia
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Oxide
An
oxide
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
Al
2
O
3
(called a
passivation layer
) that protects the foil from further
corrosion
. Different oxides of the same element are distinguished by Roman numerals denoting their
oxidation number
, e.g.
iron(II) oxide
versus
iron(III) oxide
. The two most common oxides in nature are
silicon dioxide
and
water
.
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