# Series of Reactivity of Metals

1. When a metal reacts with oxygen to form a metal oxide, a redox reaction occurs.
Metal + Oxygen → Metal oxide
2. In this reaction,
1. Metal is oxidised to metal ions. The oxidation number of the metal increases.
2. Oxygen is reduced to the oxide ion. The oxidation number of oxygen decreases from 0 to -2.
3. Metal acts as a reducing agent while oxygen acts as an oxidising agent.
3. Different metals burn in oxygen with different rate depending on their differing activeness.
4. The more reactive metal towards oxygen, the brighter and faster the combustion of the metal.
5. The arrangement of the metal according to the tendency of reaction with oxygen to form the metal oxide is known as the reactivity series of metals.
6. Figure above shows the experiment is conduct to build the reactivity series of metal. Table below shows the result of the experiment.