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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.
1 The oxidation state of oxygen in its compounds is -2, except for peroxides like H 2 O 2, and Na 2 O 2, in which the oxidation state for O is -1. 2  The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1. The oxidation state of any element such as Fe, H 2, O 2, P 4, S 8 is zero (0). 2  The oxidation state of oxygen in its compounds is -2, except for peroxides like H 2 O 2, and Na 2 O 2, in which the oxidation state for O is -1.