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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.
Answers. Best Answer: Look at the oxidation numbers Mg is 0 because it's an element not reacted with anything else Cl2 is 0 for the same reason. Mg+2 is +2 because the overall oxidation number of an ion is it's charge Cl-is -1 (I'm going to assume you forgot to include the-on the Cl).