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| | Nonmetals - Elements, Chemistry, Science 4
Hydrogen - Energy, Technology, Science 127
 ChemGlobe: HydrogenChemGlobe: Hydrogen
 Electronic, thermal, and steric data along with basic information.
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Chemical of the Week: HydrogenChemical of the Week: Hydrogen
 Equations for reactions between hydrogen and other substances.
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ChemicalElements.com: HydrogenChemicalElements.com: Hydrogen
 Basic information, atomic structure, and table of isotopes.
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EnvironmentalChemistry.com: HydrogenEnvironmentalChemistry.com: Hydrogen
 Atomic structure, chemical and physical properties, and table of nuclides.
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Especiál Gas Inc.: HydrogenEspeciál Gas Inc.: Hydrogen
 Numeric data, uses, and general information.
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Hydrogen Energies and SpectrumHydrogen 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.
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It's Elemental: HydrogenIt's Elemental: Hydrogen
 Basic physical and historical information.
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LANL: HydrogenLANL: Hydrogen
 Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications.
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Lenntech: HydrogenLenntech: Hydrogen
 Physical data, chemical properties, health and environmental effects.
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Visual Elements: HydrogenVisual Elements: Hydrogen
 General and physical information, uses, and key isotopes.
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Wikipedia: HydrogenWikipedia: Hydrogen
 Properties of the element, including its history, applications, and characteristics.
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