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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.
MSH

first chemical element in the periodic table; atomic symbol H, atomic number 1; it exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas; hydrogen ions are protons.
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