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Oxidation number can be thought of as the _____________ _____________ on each atom, in an electrically __________particle, whether the particle is an atom, or a molecular or ionic compound. An exception to the neutral particle is that the oxidation number of a freely standing ion is the same as its _________________. Oxidation # of freely standing elements = _____. Oxidation # of what four elements _______________will vary depending on what else they are bonded to.