Hydrogen Atom

A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively-charged proton and a single negatively-charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen comprises about 75% of the elemental mass of the universe. (Most of the universe's mass is not in the form of chemical elements—that is, "baryonic" matter—but is made up of dark matter and dark energy.)

In everyday life on Earth, isolated hydrogen atoms (usually called "atomic hydrogen" or, more precisely, "monatomic hydrogen") are extremely rare. Instead, hydrogen tends to combine with other atoms in compounds, or with itself to form ordinary (diatomic) hydrogen gas, H2. "Atomic hydrogen" and "hydrogen atom" in ordinary English use have overlapping meanings. For example, a water molecule contains two hydrogen atoms, but does not contain atomic hydrogen (which would refer to isolated hydrogen atoms).

Read more about Hydrogen AtomProduction and Reactivity, Isotopes, Quantum Theoretical Analysis

Other articles related to "hydrogen atom, hydrogen, atom, atoms":

Hydrogen Atom - Quantum Theoretical Analysis - Features Going Beyond The Schrödinger Solution - Hydrogen Ion
... Hydrogen is not found without its electron in ordinary chemistry (room temperatures and pressures), as ionized hydrogen is highly chemically reactive ... When ionized hydrogen is written as "H+" as in the solvation of classical acids such as hydrochloric acid, the hydronium ion, H3O+, is meant, not a literal ... Ionized hydrogen without its electron, or free protons, are common in the interstellar medium, and solar wind ...
Radical Polymerization - Termination - Chain Transfer
... to disproportionation, all chain transfer mechanisms also involve the abstraction of a hydrogen atom ... To solvent a hydrogen atom is abstracted from a solvent molecule, resulting in the formation of radical on the solvent molecules, which will not propagate further (Figure 19) ... To monomer a hydrogen atom is abstracted from a monomer ...
Whole Number Rule
... isotopes are whole number multiples of the mass of the hydrogen atom ... proposed in 1815, to the effect that atomic weights are multiples of the weight of the hydrogen atom ... an atomic mass unit (approximate mass of a proton, neutron, or hydrogen-1 atom) ...
1s Slater-type Function - Applications For Hydrogen-like Atomic Systems
... A hydrogen-like atom or a hydrogenic atom is an atom with one electron ... Except for the hydrogen atom itself (which is neutral) these atoms carry positive charge, where is the atomic number of the atom ... Because hydrogen-like atoms are two-particle systems with an interaction depending only on the distance between the two particles, their (non-relativistic) Schrödinger equation can be exactly ...
Cracking (chemistry) - Chemistry - Thermal Cracking
... An overall process of disproportionation can be observed, where "light", hydrogen-rich products are formed at the expense of heavier molecules which ... initiation usually involves breaking a chemical bond between two carbon atoms, rather than the bond between a carbon and a hydrogen atom. ... CH3CH3 → 2 CH3• Hydrogen abstraction occurs where a free radical removes a hydrogen atom from another molecule, turning the second molecule into a free radical ...

Famous quotes containing the words atom and/or hydrogen:

    What is the most rigorous law of our being? Growth. No smallest atom of our moral, mental, or physical structure can stand still a year. It grows—it must grow; nothing can prevent it.
    Mark Twain [Samuel Langhorne Clemens] (1835–1910)

    All you of Earth are idiots!... First was your firecracker, a harmless explosive. Then your hand grenade. They begin to kill your own people a few at a time. Then the bomb. Then a larger bomb, many people are killed at one time. Then your scientists stumbled upon the atom bomb—split the atom. Then the hydrogen bomb, where you actually explode the air itself.
    Edward D. Wood, Jr. (1922–1978)