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hydrogen Tweet Definition of hydrogen Like Definition of hydrogen on Facebook
noun 
  1. The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794.
  2. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature.
Etymology: From hydrogène, coined by :w:Louis-Bernard Guyton de Morveau, Louis-Bernard Guyton de Morveau.


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