See also:
ChemGlobe: Hydrogen Electronic, thermal, and steric data along with basic information. http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/1.html
Chemical of the Week: Hydrogen Equations for reactions between hydrogen and other substances. http://scifun.chem.wisc.edu/chemweek/HYDROGEN/hydrogen.html
Hydrogen Energies and Spectrum 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. http://230nsc1.phy-astr.gsu.edu/hbase/hyde.html
LANL: Hydrogen Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications. http://periodic.lanl.gov/elements/1.html
Lenntech: Hydrogen Physical data, chemical properties, health and environmental effects. http://www.lenntech.com/Periodic-chart-elements/H-en.htm
Visual Elements: Hydrogen General and physical information, uses, and key isotopes. http://www.chemsoc.org/viselements/pages/hydrogen.html
Wikipedia: Hydrogen Properties of the element, including its history, applications, and characteristics. http://en.wikipedia.org/wiki/Hydrogen