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Hydrogen - Element #1 by David L. Bergman
"Contrary to popular belief and portrayal of hydrogen in the Periodic Table of Elementary Particles, single, stand-alone atoms of hydrogen are unstable and do not exist" [PDF] (infos)Chemical of the Week: Hydrogen
Equations for reactions between hydrogen and other substances. (infos)
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. (infos)
It's Elemental: Hydrogen
Basic physical and historical information. (infos)
ChemicalElements.com: Hydrogen
Basic information, atomic structure, and table of isotopes. (infos)
Especiál Gas Inc.: Hydrogen
Numeric data, uses, and general information. (infos)
Hydrogen
Data tables and historic information. (infos)
Visual Elements: Hydrogen
General and physical information, uses, and key isotopes. (infos)
EnvironmentalChemistry.com: Hydrogen
Atomic structure, chemical and physical properties, and table of nuclides. (infos)
Lenntech: Hydrogen
Physical data, chemical properties, health and environmental effects. (infos)