hydrogen

element 1

Hydrogen

chemical element with symbol H and atomic number 1

Elektronskal 1.svg

H

Chemical element with atomic number 1 (H)

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Hydrogen is a chemical element; it has the symbol??H and atomic number??1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. 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 is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas??H2 (dihydrogen) and in molecules, such as in water and organic compounds. The most common isotope of hydrogen, 1H, consists of one proton, one electron, and no neutrons.

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Hydrogen

standard