Oxidation numbers are numbers assigned to atoms (or groups of atoms) that help chemists keep track of how many electrons are available for transfer and whether given reactants are oxidized or reduced in a reaction.
Using a list of simple rules you’ll learn how to find the oxidation numbers for elements and compounds. More oxidation help at https://www.Breslyn.org (and get all my free chem video...
In order to help students understand how to find oxidation number, the oxidation states of each individual atom in some example compounds are determined below. An illustration explaining how to find the oxidation number of the sulphur atom in a sodium sulfate molecule can be found above.