ChemicoolCooler Than Absolute Zero! Hydrogen Element Facts Data Zone | Discovery | Facts | Appearance & Characteristics | Uses | Abundance & Isotopes | References The chemical element hydrogen is classed as a nonmetal. It can become metallic at very high pressures. It was discovered in 1766 by Henry Cavendish.

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Science EducationPrivacy and Security Notice Its Elemental Previous Element (Oganesson) The Periodic Table of Elements Next Element (Helium) The Element Hydrogen [Click for Isotope Data] 1 H Hydrogen 1.00794 Atomic Number: 1 Atomic Weight: 1.00794 Melting Point: 13.81 K (-259.34°C or -434.81°F) Boiling Point:

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Hydrogen is a chemical element with chemical symbol and atomic number With an atomic weight of , hydrogen is the lightest element on the periodic table . Its monatomic form (H) is the most abundant chemical substance in the Universe , constituting roughly of all baryon ic mass. Non- remnant star s are mainly composed o

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