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Electron print that page


The electron (symbol: e − ) is a subatomic particle with a negative elementary electric charge . It has no known components or substructure; in other words, it is generally thought to be an elementary particle . [ 2 ] An electron has a mass that is approximately 1/1836 that of the

Electron configuration print that page


In atomic physics and quantum chemistry , electron configuration is the arrangement of electrons of an atom , a molecule , or other physical structure. [ 1 ] It concerns the way electrons can be distributed in the orbitals of the given system ( atomic or molecular for instance). Like

Electron optics print that page

Electrons are charged particles ( point charges with rest mass ). The electron also has an associated spin of + 1/2. While in motion an electron possesses kinetic energy , regardless of any imposed charge field—this could be achieved by accelerating electrons via a voltage differential

wikipedia.org | 2011/6/9 6:08:15

Electron multiplier print that page


An electron multiplier is a vacuum-tube structure that multiplies incident charges. [ 1 ] In a process called secondary emission , a single electron can, when bombarded on secondary emissive material, induce emission of roughly 1 to 3 electrons . If an electric potential is applied between

Electron neutrino print that page


The electron neutrino ( ν e ) is a subatomic lepton elementary particle which has no net electric charge . Together with the electron it forms the first generation of leptons, hence its name electron neutrino . It was first hypothesized by Wolfgang Pauli in 1930, to account for

Electron diffraction print that page


to study the crystal structure of solids. Experiments are usually performed in a transmission electron microscope (TEM), or a scanning electron microscope (SEM) as electron backscatter diffraction . In these instruments, electrons are accelerated by an electrostatic potential in order

Electron microscope print that page


An electron microscope is a type of microscope that uses a particle beam of electrons to illuminate the specimen and produce a magnified image. Electron microscopes (EM) have a greater resolving power than a light-powered optical microscope , because electrons have wavelengths about

Valence electron print that page

other atoms to form chemical bonds. In a single covalent bond both atoms contribute one valence electron to form a shared pair . For main group elements , only the outermost electrons are valence electrons. In transition metals , some inner-shell electrons are also valence electrons. Valence

wikipedia.org | 2011/10/4 15:32:39

Electron density print that page

In molecules , regions of electron density are usually found around the atom , and its bonds. In de-localized or conjugated systems , such as phenol , benzene and compounds such as hemoglobin and chlorophyll , the electron density covers an entire region, i.e., in benzene they are found

wikipedia.org | 2011/4/27 22:35:03

Transmission electron microscopy print that page


modulations in chemical identity, crystal orientation, electronic structure and sample induced electron phase shift as well as the regular absorption based imaging. The first TEM was built by Max Knoll and Ernst Ruska in 1931, with this group developing the first TEM with resolving power