Some example of Oxidation are: (1) Combination with Oxygen: 2Mg + O<sub>2</sub> → 2MgO (2) Removal of Hydrogen : H<sub>2</sub>S + Br<sub>2</sub> → 2HBr + S (3) Combination with electronegative element: 2FeCl<sub>2</sub> + Cl<sub>2</sub> → 2FeCl<sub>3</sub>