See also:
 | - 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.
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 | - LANL: 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: Hydrogen - - Physical data, chemical properties, health and environmental effects.
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 | - Wikipedia: Hydrogen - - Properties of the element, including its history, applications, and characteristics.
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