Hydrogen takes the symbol H. It is the lowest density gas on Earth and is colorless and odorless. It is also tasteless, non-toxic and non-metallic, although it is very flammable. Its atomic number is 1 and its relative atomic mass is 1.008.
It exists in all living things and it is the most common element in the universe. Hydrogen can be found in the sun, in stars and on other planets. Most hydrogen on Earth is in water. In its gaseous state, it rises and escapes into space.
Hydrogen is generated from water and it becomes water again once it is oxidized. It has several uses; it is used as a source of power and to make ammonia for agricultural fertilizer. It is also used in the production of plastics, in the electronics industry and in the pharmaceutical industry. It is used to make glass and to fill balloons. In the past it was used to fill airships, but after several disasters and many deaths, this use ended.
Hydrogen was discovered in 1766 by Henry Cavendish, the British scientist. The name comes from the Greek words hydro and genes and it means water forming.Learn more about Atoms & Molecules