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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 chlorine in dichlorine oxide is 1. 1  Formula: Cl 2 O. 2  Hill system formula: Cl 2 O 1. 3  CAS registry number: [7791-21-1]. 4  Formula weight: 86.905.5  Class: oxide. 6  Colour: brownish-yellow.7  Appearance: gas. 8  Melting point: -121Â°C.he data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following. 1  R.T. 2  Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960. 3  N.N. 4  Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.