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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 this mechanism the chlorine atom (Cl) serves as a catalyst, and ClO is an intermediate. Neither appear in the overall reaction (O3 + O --> 2O2), which is important. Intermediates are produced in one step, while eliminated in subsequent steps. On the other hand, catalysts are not used up during a reaction. While Cl reacts initially, it is reproduced in the second step.