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Best Answer: chlorine atom (Cl) = 0 Chlorine (Cl2) = -1 sodium chloride (NaCl) = -1 Oxidation state is defined as the charge an atom has when electrons are counted according to an agreed-upon set of rules: (l) the oxidation state of a free element (uncombined element) is zero; Ex.
For the Br (bromine) ion, the charge is -1, so the oxidation number is -1. Another example would be for the Ba (barium) ion, the charge is +2, so the oxidation number is +2. For the S (sulfur) ion, the charge is -2; the oxidation number is -2.