hydrogen
Sign in to saveHydrogen is a chemical element; it has the symbolH and atomic number1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas (dihydrogen) and in molecules, such as in water and org
AI overview
Hydrogen is the lightest and most abundant chemical element in the universe, making up about 75% of all normal matter and forming the primary fuel of stars like our Sun. On Earth, hydrogen exists as a colorless, odorless gas that is highly combustible and is also found in water and other molecules, making it potentially valuable as an energy source.
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Wikidata facts
- Instance of
- atmophile element
- Subclass of
- reducing agent
- Part of
- water
- Named after
- water (from 1783)
- Mass
- +1.008
- Image
- Elektronskal 1.svg
Show 7 more facts
- P2152
- antihydrogen
Article
48 sectionsContents
- Properties
- Atomic hydrogen
- Electron energy levels
- Nomenclature
- Isotopes
- Dihydrogen
- Combustion
- Spin isomers
- Phases
- Thermal and physical properties
- History
- 18th century
- 19th century
- 20th century
- Hydrogen-lifted airship
- Deuterium and tritium
- Chemistry
- Reactions of H<sub>2</sub>
- Hydrogen-containing compounds
- Hydrogen bonding
- Protons and acids
- Occurrence
- Cosmic
- Terrestrial
- Production and storage
- Industrial routes
- Steam reforming
- Partial oxidation of hydrocarbons
- Water electrolysis
- Methane pyrolysis
- Thermochemical
- Natural routes
- Biohydrogen
- Serpentinization
- Laboratory syntheses
- Storage
- Applications
- Petrochemical industry
- Hydrogenation
- Fuel
- Nickel–hydrogen battery
- Semiconductor industry
- Niche and evolving uses
- Safety and precautions
- See also
- References
- Further reading
- External links
Hydrogen is a chemical element; it has the symbolH and atomic number1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas (dihydrogen) and in molecules, such as in water and organic compounds. The most common isotope of hydrogen, H, consists of one proton, one electron, and no neutrons.
Hydrogen gas was first produced artificially in the 17thcentury by the reaction of acids with metals. Henry Cavendish, in1766–1781, identified hydrogen gas as a distinct substance and discovered its property of producing water when burned: this is the origin of hydrogen's name, which means (from , and ). Understanding the colors of light absorbed and emitted by hydrogen was a crucial part of the development of quantum mechanics.