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The 59 pages that link to Hydrogen, each with the reason it gives.

• ProtonBroader topic: A hydrogen-1 nucleus is a single proton.

• WaterRelated: Two hydrogen atoms bond to oxygen to make each water molecule.

• Molecular cloudNarrower topic: Hydrogen dominates cloud mass and occurs in both atomic and molecular forms.

• MethaneCompared with: Hydrogen can replace methane in some energy uses but requires different storage and infrastructure.

• HydrogenationRelated: Molecular hydrogen is the usual hydrogen source in catalytic hydrogenation.

• MetallicityRelated: Hydrogen abundance often supplies the denominator in astronomical metallicity measurements.

• Alkali metalCompared with: Hydrogen is positioned above Group 1 but is a nonmetal, not an alkali metal.

• Ionization energyBroader topic: Its single-electron atom provides the simplest ionization-energy case.

• SerpentinizationRelated: Oxidation of ferrous iron during alteration can release molecular hydrogen.

• Hydrogen storageNarrower topic: Its low molecular mass and small molecules shape containment and storage challenges.

• Potassium hydroxideRelated: Hydrogen bonds to oxygen in the hydroxide ion present in KOH.

• DeuteriumNarrower topic: Deuterium belongs to hydrogen because its nucleus contains one proton.

• Solar nebulaRelated: Hydrogen dominated the nebula’s gas and became the Sun’s main fuel.

• Direct reduced ironRelated: Hydrogen can serve as the reducing agent in DRI production, especially when made with low-carbon energy.

• Gas giantRelated: It is the dominant element in a gas giant’s atmosphere and interior.

• HydroformylationRelated: Molecular hydrogen supplies the hydrogen incorporated during aldehyde formation.

• Henry CavendishBroader topic: Cavendish generated and characterized the gas he called inflammable air, now identified as hydrogen.

• Skeletal formulaRelated: Hydrogens attached to carbon are usually implicit rather than drawn.

• Ammonia synthesisRelated: Hydrogen supplies the other reactant and strongly influences the process's emissions profile.

• Diatomic moleculeBroader topic: Hydrogen gas is the smallest and most abundant stable homonuclear diatomic molecule.

• DiboraneRelated: Diborane’s terminal and bridging hydrogen atoms play distinct structural roles.

• Jacques CharlesRelated: Its low density supplied the buoyancy for Charles's balloons.

• Sodium borohydrideRelated: Its release during borohydride decomposition creates fire and pressure hazards.

• Power-to-XNarrower topic: Many Power-to-X pathways use hydrogen as an intermediate molecule.

• Alberto Santos-DumontRelated: Hydrogen filled several of his dirigibles, supplying buoyant lift.

• AntihydrogenCompared with: It is antihydrogen’s ordinary-matter counterpart and the reference for precision comparisons.

• ArsineRelated: Hydrogen atoms form the three As–H bonds in arsine.

• Atmosphere of JupiterRelated: Molecular hydrogen makes up most of Jupiter’s atmosphere by number of molecules.

• Hydrogen safetyNarrower topic: Its properties set the baseline for leak, dispersion, and ignition hazards.

• Neutron moderationRelated: Its nucleus has nearly the same mass as a neutron, allowing large energy transfers per collision.

• ProtiumNarrower topic: Protium is the ordinary isotope of hydrogen, distinguished by its neutron count.

• Sodium hydrideRelated: Hydrogen gas forms when sodium hydride encounters water or other proton donors.

• Water–gas shift reactionRelated: It is the valuable product increased by shifting carbon monoxide with steam.

• Gas balloonRelated: It provides strong lift but introduces a serious fire and explosion hazard.

• Hydrogen bromideRelated: Hydrogen supplies one atom to each HBr molecule.

• Lost City Hydrothermal FieldRelated: Serpentinization generates hydrogen that supports chemical reactions in the vent ecosystem.

• SerpentiniteRelated: Hydrogen produced during serpentinization can fuel subsurface microbial ecosystems.

• NonmetalBroader topic: Hydrogen is placed above group 1 but behaves as a nonmetal rather than an alkali metal.

• Solar coreRelated: Hydrogen nuclei are the starting material for the core’s main energy-producing reactions.

• Ferdinand von ZeppelinRelated: Hydrogen provided the lift for early Zeppelins but made them highly flammable.

• Hydrogen chalcogenideRelated: Hydrogen bonds to the chalcogen in each binary compound in this family.

• Hydrogen iodideRelated: Hydrogen supplies the proton and electron in the diatomic molecule.

• AerostatRelated: Hydrogen enabled early gas balloons but introduced severe fire risk.

• Giant planetRelated: Hydrogen is the dominant constituent of Jupiter and Saturn and a major atmospheric gas elsewhere.

• Lithium hydrideRelated: Hydrogen becomes the hydride component of LiH and is released as H₂ during hydrolysis.

• Neutron imagingRelated: Hydrogen-rich materials often stand out in neutron transmission images.

• SyngasRelated: It is a principal syngas component and a valuable product in its own right.

• Argon fluorohydrideRelated: A hydrogen atom occupies the central position in the H–Ar–F framework.

• Interstellar cloudRelated: Hydrogen makes up most of the gas in typical interstellar clouds.

• Potassium hydrideRelated: Hydrogen gas is produced when potassium hydride reacts with water.