hydrogen
First periodic entry
Hydrogen is the lightest and most abundant element in the universe, a colorless, odorless gas that combines with oxygen to form water.
Its name means "water-former." Hydrogen appears in countless compounds and serves as a fuel source: hydrogen fuel cells, the hydrogen bomb.
In chemistry, hydrogen has atomic number 1.
Basic substance or factor
- atomElement's smallest unit
- moleculeBonded atomic group
- protonPositive nuclear particle
- electronNegative subatomic particle
ion · isotope · deuterium · tritium · protium · covalent · bonding · oxidation
Minimum in heaviness
- simplestMost uncomplicated
- protonPositive nuclear particle
- electronNegative subatomic particle
- massQuantity of matter
diatomic · gas · colorless · odorless · flammable · H2 · quantum · ionization
Luminous astronomical object
- sunEarth's primary star
- fusionJoining into unity
- heliumLightest noble gas
- nebulaInterstellar gas formation
plasma · nucleosynthesis · primordial · cosmology · interstellar · supernova · galaxy · stellar
Exothermic reaction with oxygen
- renewableCapable of restoration
- electrolysisCurrent-induced ionic separation
- greenColor of vegetation
- sustainabilityCapacity to endure indefinitely
decarbonization · refueling · transportation · vehicles · emission-free · storage · infrastructure · Hindenburg
Water's molecular notation
- electrolysisCurrent-induced ionic separation
- moistureSmall amounts of liquid
- vaporGaseous form of liquid
- iceWater's solid form
liquid · splitting · photolysis · polar
element
Basic substance or factor
electron · ion · isotope · deuterium · tritium · protium · covalent · bonding · oxidation · reduction
lightest
Minimum in heaviness
mass · diatomic · gas · colorless · odorless · flammable · H2 · quantum · ionization
star
Luminous astronomical object
nebula · plasma · nucleosynthesis · primordial · cosmology · interstellar · supernova · galaxy · stellar · photosphere
combustion
Exothermic reaction with oxygen
- renewableCapable of restoration
- electrolysisCurrent-induced ionic separation
- greenColor of vegetation
sustainability · decarbonization · refueling · transportation · vehicles · emission-free · storage · infrastructure · Hindenburg · efficiency
H2O
Water's molecular notation
- electrolysisCurrent-induced ionic separation
- moistureSmall amounts of liquid
- vaporGaseous form of liquid
ice · liquid · splitting · photolysis · polar
alkane
Saturated hydrocarbon series
saturation · unsaturation · polymer · bonding · reduction · synthesis · cracking · reforming · petroleum · biochemistry
hydrogenuranium
Element ninety-two
plutonium · einsteinium · californium · lead · fermium
hydrogenastatine
Radioactive element 85
francium · technetium · neptunium · berkelium
- hydrogen balloonBuoyant craft using lightest element
- hydrogen bombThermonuclear fusion weapon
- hydrogen peroxideOxidizing disinfectant and bleach
- hydrogen bondElectronegativity-based intermolecular attraction
- hydrogenated oilsFats altered with added atoms
- liquid hydrogenCryogenic form of lightest element
hydrogen peroxide, hydrogenation, hydrogens, hydrogenate, hydrogenated, hydrogen bomb, hydrogenates, hydrogenating, hydrogen gas