Hydrogen is the most abundant element in the universe. Being constructed of 1 proton and 1 electron it has no neutrons. It is used in industrial processes such as the Haber process and the hydrogenation of fats. Hydrogen is being explored as use for a fuel. It is possible to combust Hydrogen with Oxygen to create water as a by product and generate electricity in a cell. It has a large use in powering rockets in the NASA space program due to its high combustibility. It was used in the German airship, the Hindenburg which tragically exploded due to the flammable nature of Hydrogen in 1937. Hydrogen is located usually in Group 1 but can also be located in the centre of the periodic table. As it is a non metal if it is located in Group 1 it can be misleading. It has a melting point of -259°c and a boiling point of -252°c. Hydrogen exists as a diatomic molecule, where two Hydrogen atoms are covalently bonded together. Hydrogen was discovered by Robert Boyle in 1671 from his work reacting acids and metals together but it was not until 1766 that the scientist Henry Cavendish isolated it as an element.
Most hydrogen is used in the production of ammonia. Also used in balloons and in metal refining. Also used as fuel in rockets. Its two heavier isotopes are: deuterium (D) and tritium (T) used respectively for nuclear fission and fusion.
Commercial quantities are produced by reacting superheated steam with methane or carbon. In lab work from reaction of metals with acid solutions or electrolysis.