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In page Peroxide:

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The characteristic structure of any regular peroxide is the oxygen–oxygen covalent single bond, which connects the two main atoms together. Each oxygen atom has a oxidation state of negative one, as 5 of its valence electrons remain in the outermost orbital shell whilst one is occupied in the covalent bond. Because of the nature of the covalent bond, this arrangement results in each atom having the equivalent of 7 valence electrons, reducing the oxygens and giving them a negative charge. This charge is affected by the addition of other elements, with the properties and structure changing depending on the added group(s).[citation needed]