Hydrogen

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» 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 - Data tables and historic information.
» 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]
» 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 charateristics.