- Chemical of the Week: Hydrogen - http://scifun.chem.wisc.edu/chemweek/hydrogen/hydrogen.html
- Equations for reactions between hydrogen and other substances.
- Hydrogen Energies and Spectrum - http://230nsc1.phy-astr.gsu.edu/hbase/hyde.html
- The Bohr model for an electron transition in hydrogen between quantized energy levels with different quantum numbers n yields a photon by emission with quantum energy.
- It's Elemental: Hydrogen - http://education.jlab.org/itselemental/ele001.html
- Basic physical and historical information.
- ChemicalElements.com: Hydrogen - http://www.chemicalelements.com/elements/h.html
- Basic information, atomic structure, and table of isotopes.
- Especiál Gas Inc.: Hydrogen - http://www.c-f-c.com/specgas_products/hydrogen.htm
- Numeric data, uses, and general information.
- Visual Elements: Hydrogen - http://www.chemsoc.org/viselements/pages/hydrogen.html
- General and physical information, uses, and key isotopes.
- EnvironmentalChemistry.com: Hydrogen - http://environmentalchemistry.com/yogi/periodic/h.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Hydrogen - http://www.lenntech.com/periodic-chart-elements/h-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Hydrogen - http://en.wikipedia.org/wiki/hydrogen
- Properties of the element, including its history, applications, and characteristics.
- LANL: Hydrogen - http://periodic.lanl.gov/elements/1.html
- Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications.
- ChemGlobe: Hydrogen - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/1.html
- Electronic, thermal, and steric data along with basic information.
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