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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.
Ca++ and Ca+2 are the same, the ion of the element calcium with a +2 charge after giving away 2 outer electrons. Cl- is the chloride ion, chlorine after taking an electron to fill the outer ring, charge -1. science teacher Â· 10 years ago.