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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.
In the nomenclature of inorganic chemistry, the oxidation number of an element that may exist in more than one oxidation state is indicated by a roman numeral in parentheses after the name of the elementâe.g., iron(II) chloride (FeCl 2) and iron(III) chloride (FeCl 3).