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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.
The oxidation number of an element in a monatomic ion is the charge of the ion. Therefore, the oxidation number of the sodium ion, Na+, is+1 while the oxidation. number of the chloride ion, Cl-, is -1. 9. The sum of the oxidation numbers in a compound is always zero. 10. In a polyatomic ion, the sum of the oxidation numbers of the atoms is equal to the. charge of the ion. 11. When combined, oxygen is usually assigned an oxidation number of -2. 12. When combined, hydrogen is usually assigned an oxidation number of +1.