hydrogen

hydrogen hīˈdrəjən [key] [Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14℃; b.p. −252.87℃; density 0.08988 grams per liter at STP; valence usually +1.

Sections in this article:

• Introduction
• Discovery of Hydrogen and Its Isotopes
• Uses
• Sources and Commercial Preparation
• Properties
• The Isotopes and Forms

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