OXIDATION REDUCTION REACTIONS REDOX Rusting of iron Fe an oxidation of Fe Manufacture of iron Fe a reduction of Fe2O3 OXIDATION the loss of one or more electrons in a substance REDUCTION the gain of one or more electrons by a substance OXIDATION NUMBER state 1 An atom is its elemental state has an oxidation number is 0 2 An atom in a monoatomic ion has an oxidation number identical to its charge 3 An atom is a polyatomic ion or in a molecular compound usually has the same oxidation number it would have if it were a monoatomic ion a hydrogen can either be 1 or 1 b oxygen usually has an oxidation number of 2 c halogens usually have an oxidation number of 1 4 The sum of the oxidation numbers is 0 for a neutral compound and is equal to the net charge for a polyatomic ion Oxidizing agent causes oxidation gains one or more electrons undergoes reduction oxidation number of atom decreases Reducing agent causes reduction loses one or more electrons undergoes oxidation oxidation number of atom increases ACTIVITY SERIES OF THE ELEMENTS
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