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.
It's Elemental: Hydrogen
Basic physical and historical information.
Wikipedia: Hydrogen
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Hydrogen
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Hydrogen
Electronic, thermal, and steric data along with basic information.
LANL: Hydrogen
Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications.
Chemical of the Week: Hydrogen
Equations for reactions between hydrogen and other substances.
Especiál Gas Inc.: Hydrogen
Numeric data, uses, and general information.
ChemicalElements.com: Hydrogen
Basic information, atomic structure, and table of isotopes.
Visual Elements: Hydrogen
General and physical information, uses, and key isotopes.
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]
Lenntech: Hydrogen
Physical data, chemical properties, health and environmental effects.
Hydrogen
Data tables and historic information.
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