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Generally, oxygen will have an oxidation number of -2 and hydrogen will have an oxidation number of +1 across different compounds. However, there are a few exceptions to this (for example, H2O2 where oxygen has an oxidation number of -1.)
The overall charge of a compound is zero unless it is specifically written with a charge. The oxidation numbers for individual elements can be inferred just by looking at the periodic table and deciding which elements are likely to lose or gain electrons. An exception is oxygen which normally has a charge of -2, but becomes -1 in peroxides.
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