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The oxidation number of sodium in sodium bromide is 1. 1  Formula: NaBr. 2  Hill system formula: Br 1 Na 1. 3  CAS registry number: [7647-15-6]. 4  Formula weight: 102.894. 5  Class: bromide. 6  Colour: white. 7  Appearance: crystalline solid. 8  Melting point: 747Â°C. 9  Boiling point: 1390Â°C. 10  Density: 3200 kg m -3.
Sodium peroxide. Sodium peroxide is the inorganic compound with the formula Na2O2. This yellowish solid is the product of sodium ignited in excess oxygen. It is a strong base. It exists in several hydrates and peroxyhydrates including Na2O2Â·2H2O2Â·4H2O, Na2O2Â·2H2O, Na2O2Â·2H2O2, and Na2O2Â·8H2O.