Hydrogen is a chemical element; it has the symbolH and atomic number1. 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, 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 (dihydrogen) and in molecules, such as in water and org
Hydrogen is the lightest and most abundant chemical element in the universe, making up about 75% of all normal matter and forming the primary fuel of stars like our Sun. On Earth, hydrogen exists as a colorless, odorless gas that is highly combustible and is also found in water and other molecules, making it potentially valuable as an energy source.
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Hydrogen is a chemical element; it has the symbolH and atomic number1. 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, 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 (dihydrogen) and in molecules, such as in water and organic compounds. The most common isotope of hydrogen, H, consists of one proton, one electron, and no neutrons.
Hydrogen gas was first produced artificially in the 17thcentury by the reaction of acids with metals. Henry Cavendish, in1766–1781, identified hydrogen gas as a distinct substance and discovered its property of producing water when burned: this is the origin of hydrogen's name, which means (from , and ). Understanding the colors of light absorbed and emitted by hydrogen was a crucial part of the development of quantum mechanics.
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