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  1. Hydrogen is the most abundant element in the universe and has the lowest density of all gases. Its relative atomic mass is 1.008 and its atomic number is 1. Learn more about its history, isotopes, biological role and applications.

    • Hydrogen

      More Information about hydrogen. Visual Elements Video 1:21...

    • Help

      The number of atoms of the element per 1 million atoms of...

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      For technical issues with this website, contact...

    • Lead

      Lead - Hydrogen - Element information, properties and uses |...

    • Darmstadtium

      Darmstadtium - Hydrogen - Element information, properties...

    • Niobium

      Niobium - Hydrogen - Element information, properties and...

    • Uranium

      Uranium - Hydrogen - Element information, properties and...

    • Argon

      Element Argon (Ar), Group 18, Atomic Number 18, p-block,...

  2. en.wikipedia.org › wiki › HydrogenHydrogen - Wikipedia

    Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H 2, sometimes called dihydrogen, [11] but more commonly called hydrogen gas, molecular hydrogen or simply hydrogen.

  3. Learn about the atomic number, mass, radius, density, electron configuration and other properties of hydrogen, the lightest and most abundant element in the Universe. Find out how hydrogen differs from other elements in its chemical behavior and bonding.

  4. 21 lis 2020 · Learn about the atomic mass, mass number, and neutron number of elements and their isotopes. Find out how to calculate the density and atomic number density of substances based on their atomic mass and atomic number.

  5. Hydrogen is the lightest element with a mass number of 1. Learn about its history, electron configuration, isotopes, applications and hazards from this web page.

  6. Learn about hydrogen, the most abundant element in the universe and the first in the periodic table. Find out its atomic number, mass number, isotopes, electron configuration, and more.

  7. Hydrogen has three known isotopes. The mass numbers of hydrogen’s isotopes are 1, 2, and 3, the most abundant being the mass 1 isotope generally called hydrogen (symbol H, or 1 H) but also known as protium.

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