H2
Water's chemical formula
H2 is the chemical formula for molecular hydrogen, the most abundant element in the universe.
The subscript 2 indicates two hydrogen atoms bonded together, forming the gas that makes up most of the sun and stars.
In everyday contexts, H2 appears in discussions of hydrogen fuel cells and clean energy, where it serves as an alternative to fossil fuels.
The new buses run on H2 instead of diesel.
Hydrogen isotope with neutron
- tritiumHydrogen's radioactive isotope
- protiumSingle-proton hydrogen isotope
- isotopicVarying in nuclear mass
- massQuantity of matter
neutron · nucleus · radioactive · stable · fractionation · enrichment · tracer · spectroscopy
Sharing electrons between atoms
- bondBinding tie or connection
- diatomicHaving two atoms
- electronNegative subatomic particle
- protonPositive nuclear particle
valence · orbital · synthesis · catalyst · compound · reactivity · reduction · oxidation
Simplest atomic element
- heliumLightest noble gas
- lithiumLightest solid element
- berylliumFourth periodic table element
- boronFifth element, symbol B
carbon · nitrogen · oxygen · fluorine · neon · sodium · magnesium · aluminum
Capable of restoration
- greenColor of vegetation
- alternativeAnother available choice
- electrolysisCurrent-induced ionic separation
- combustionExothermic reaction with oxygen
storage · tank · pipeline · refueling · efficiency · decarbonization · mobility · vehicle
Devoid of pigmentation
- odorlessHaving no smell
- flammableProne to ignition
- explosiveProne to sudden detonation
- balloonInflatable rubber sac
airship · Hindenburg · cylinder · compression · storage · leak · detection · density
deuterium
Hydrogen isotope with neutron
- tritiumHydrogen's radioactive isotope
- protiumSingle-proton hydrogen isotope
- isotopicVarying in nuclear mass
mass · neutron · nucleus · radioactive · stable · fractionation · enrichment · tracer · spectroscopy
covalent
Sharing electrons between atoms
proton · valence · orbital · synthesis · catalyst · compound · reactivity · reduction · oxidation · electrolysis
hydrogen
Simplest atomic element
boron · carbon · nitrogen · oxygen · fluorine · neon · sodium · magnesium · aluminum · silicon
renewable
Capable of restoration
- greenColor of vegetation
- alternativeAnother available choice
- electrolysisCurrent-induced ionic separation
combustion · storage · tank · pipeline · refueling · efficiency · decarbonization · mobility · vehicle · bus
colorless
Devoid of pigmentation
balloon · airship · Hindenburg · cylinder · compression · storage · leak · detection · density · buoyancy
plasma
Electrified matter state
helium · neutron · star · sun · core · ignition · confinement · magnetic · thermonuclear · power
interstellar
Between celestial bodies
corona · spectral · Lyman · absorption · emission · redshift · cosmology · universe · abundance · primordial
- time periodsday, year, month, week, hour
- Chemical FormulasH2O, CO2, NaCl, O2, N2
- Hydrogenhydrogen, hydrogen gas, hydrogen fuel, dihydrogen, protium
- Defunct ChannelsG4, Vine, Court TV
- KawasakiNinja, Vulcan, Mule, Voyager, Bayou
- headersheading, headline, subheading, page header, column header