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oxidation number of the atoms

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Determine the oxidation number for the indicated element in each of the following substances.

S in SO2

C in COCl2

Mn in MnO4-

Br in HBrO

As in As4

O in K2O2

Im pretty lost on how to find them.

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please see the attached file for detailed solution.

Several general rules regarding the oxidation number:
Rules: (1) The sum of the O.N. must be 0 for an electrically neutral compound; (2) The sum of the O.N. must equal the ...

Solution Summary

The solution explains the general rules of determining the oxidation number of the atoms. It further explains the rules in several examples.