This article is about the physics of the hydrogen atom. For a chemical description, see hydrogen. For hydrogen with neutrons, see isotopes of hydrogen.
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A colorless, highly flammable element, that occurs as a diatomic molecule, H2, the lightest of all gases and the most abundant element in the universe, used in ...
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a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; ...
At room temperature
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