How to calculate oxidation number of an element and compound
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1 -The oxidation number of a free element is always 0.2 -The oxidation number of a monatomic ion equals the charge of the ion.3 -The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements.4 -The oxidation number of O in compounds is usually -2, but it is -1 in peroxides.