See also:

• Science: Chemistry: Elements: Nonmetals  (4)
• Science: Technology: Energy: Hydrogen  (127)

ChemGlobe: Hydrogen - Electronic, thermal, and steric data along with basic information..

Chemical of the Week: Hydrogen - Equations for reactions between hydrogen and other substances..

ChemicalElements.com: Hydrogen - Basic information, atomic structure, and table of isotopes..

EnvironmentalChemistry.com: Hydrogen - Atomic structure, chemical and physical properties, and table of nuclides..

Especiál Gas Inc.: Hydrogen - Numeric data, uses, and general information..

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..

LANL: Hydrogen - Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications..

Lenntech: Hydrogen - Physical data, chemical properties, health and environmental effects..

Visual Elements: Hydrogen - General and physical information, uses, and key isotopes..

Wikipedia: Hydrogen - Properties of the element, including its history, applications, and characteristics..