Hydrogen is a chemical element having an atomic number equal to one.
It was discovered by Henry Cavendish.
It is a gas with no colour and odour and has the lowest density of all gases.
It is a highly inflammable gas.
It exists in the diatomic form in nature so 2 atoms of hydrogen make one molecule of H2.
Uses of Hydrogen:
Hydrogen is used in the synthesis of ammonia () and the manufacture of nitrogenous fertilizers.
It is used in the manufacture of many organic compounds, for example, methanol ().
By the process of hydrogenation vegetable oils that have long unsaturated carbon chains are converted into saturated fatty acids that are vegetable ghee.
Hydrogen is used as rocket fuel in many space research activities.