Hydrogen was recognized as a distinct element by Henry Cavendish in 1776. It is one of the most abundant substances in the Universe.
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- Wikipedia: Hydrogen Includes an article with pictures covering properties, applications, history, forms and safety precautions.
- ChemicalElements.com: Hydrogen Features basic information, an atomic structure diagram, facts and a table of isotopes.
- Chemical of the Week: Hydrogen Includes a collection of equations showing reactions between hydrogen and other substances.
- It's Elemental: Hydrogen Includes physical properties and information about the uses and history of hydrogen.