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  1. Hydrogen - Wikipedia

    Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen …

  2. Hydrogen - Reactivity, Uses, Properties | Britannica

    Dec 7, 2025 · One molecule of hydrogen dissociates into two atoms (H 2 → 2H) when an energy equal to or greater than the dissociation energy (i.e., the amount of energy required to break …

  3. What is h2 in chemistry? - California Learning Resource Network

    Apr 18, 2025 · Hydrogen (H 2), a diatomic molecule consisting of two hydrogen atoms covalently bonded, holds a position of paramount importance in chemistry, physics, and increasingly, in …

  4. H2 Definition - Intro to Chemistry Key Term | Fiveable

    H2 is the chemical formula for the diatomic molecule of hydrogen, which is the simplest and most abundant element in the universe. This term is crucial in understanding the phases and …

  5. The Element Hydrogen -- Hydrogen Atom - World of Molecules

    Hydrogen is the lightest chemical element with its most common isotope consisting of just a single proton and electron. At standard temperature and pressure conditions, hydrogen forms a …

  6. What is Hydrogen (H2) Gas? - gasdog.com

    Jun 26, 2025 · Hydrogen (H2) gas is widely recognized as one of the most important elements in the universe and a potential fuel for a clean energy future. As the lightest and most abundant …

  7. Hydrogen | H2 | CID 783 - PubChem

    Hydrogen is a colorless, odorless gas. It is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The vapors are lighter than air. It is flammable over a wide range of …

  8. H2 - Wikipedia

    Armenia 2 (H2), a private television company broadcasting in Armenia and Nagorno-Karabakh H2 (A&E Networks), the rebranded name of the former channel History International H2 …

  9. H2 Definition - General Biology I Key Term | Fiveable

    H2 is the most abundant molecule in the universe, playing a crucial role in the formation of stars and galaxies. In biological systems, H2 is produced during metabolic processes and serves as …

  10. 2026 Kawasaki Teryx H2 Side-by-Side Cranks Up the Power

    Aug 20, 2025 · Nevertheless, this blown 1.0-liter is a rad engine. It's closely related to the fire-breathing engine in the Kawasaki H2 superbike. Its little supercharger is driven off the …