protium
Common hydrogen form
Protium is the most common isotope of hydrogen, with a nucleus containing a single proton and no neutrons.
It constitutes more than 99.9% of naturally occurring hydrogen.
The term distinguishes ordinary hydrogen from its heavier isotopes deuterium and tritium, which have one and two neutrons respectively.
isotope
Protonless-neutron isotope
cosmological
Atomic core formation process
- primordialExisting from the start
- cosmologyStudy of universal structure
chemistry
Bonding hydrogen to compounds
- hydrogen-bondingElectrostatic attraction between molecules
- H₂Hydrogen in molecular form
- diatomicHaving two atoms
- acid-baseProton donor-acceptor chemistry
reduction · oxidation · catalysis · electrolysis · combustion
hydrogen-1
Protonless-neutron isotope
electron
Negative subatomic particle
nucleosynthesis
Atomic core formation process
- primordialExisting from the start
- cosmologyStudy of universal structure
hydrogenation
Bonding hydrogen to compounds
- hydrogen-bondingElectrostatic attraction between molecules
- H₂Hydrogen in molecular form
- diatomicHaving two atoms
acid-base · reduction · oxidation · catalysis · electrolysis · combustion
predominant
Most common or powerful
- ubiquitousPresent in all places
- terrestrialRelating to land