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The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.

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Tree Number(s): D01.268.406, D01.362.340

MeSH Unique ID: D006859

Registry Number: 7YNJ3PO35Z

Entry Terms:

  • Hydrogen-1
  • Hydrogen 1

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