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See also:
- 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.
