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that contains at least one
atom and one other element in its
oxides typically contain an
of -2. Most of the
consists of solid oxides, the result of elements being oxidized by the oxygen in air or in water.
combustion affords the two principal
. Even materials considered pure elements often develop an oxide coating. For example,
develops a thin skin of
) that protects the foil from further
. Different oxides of the same element are distinguished by Roman numerals denoting their
. The two most common oxides in nature are
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