electron


Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to electron: electron microscope, atom, Electron configuration, Electron radius

electron

 [e-lek´tron]
any of the negatively charged particles arranged in orbitals around the nucleus of an atom and determining all of the atom's physical and chemical properties except mass and radioactivity. Electrons flowing in a conductor constitute an electric current; when ejected from a radioactive substance, they are beta particles.ƒ

The number of electrons revolving around the nucleus of an atom is equal to its atomic number. An atom of oxygen, for instance, which has an atomic number of 8, has eight electrons in orbit around the nucleus in a manner similar to the planets revolving around the sun in our solar system.

Electrons greatly influence the behavior of an atom toward other atoms. The combination of various elements to form compounds is brought about by the losing or gaining of electrons; the process is sometimes called “sharing” of electrons. For example, the combination of the elements sodium and chlorine produce the compound sodium chloride (table salt). This is accomplished by the transfer of one electron from the outer electron shell of the sodium atom to the outer electron shell of the chlorine atom. This combining of elements by the loss or gain of electrons is called electrovalence.

e·lec·tron (β-),

(ē-lek'tron),
One of the negatively charged subatomic particles that orbit the positive nucleus, in one of several energy levels called shells; in mass they are estimated to be 1/1836.15 of a proton; when emitted from inside the nucleus of a radioactive substance, electrons are called β particles. A nucleus and its electrons constitute an atom.
See also: shell.
[electro- + -on]

electron

/elec·tron/ (e-lek´tron) an elementary particle with the unit quantum of (negative) charge, constituting the negatively charged particles arranged in orbits around the nucleus of an atom and determining all of the atom's physical and chemical properties except mass and radioactivity.electron´ic

electron

[ilek′tron]
Etymology: Gk, elektron, amber
1 a negatively charged elementary particle that has a specific charge, mass, and spin. The number of electrons associated with the nucleus of an atom is equal to the atomic number of the substance.
2 a negative beta particle emitted from a radioactive substance. See also atom, element, ion, neutron, proton.

e·lec·tron

(β-) (ĕ-lek'tron)
One of the negatively charged subatomic particles that are distributed about the positive nucleus and with it constitute the atom; in mass they are estimated to be 1/1836.15 of a proton; when emitted from inside the nucleus of a radioactive substance, electrons are called beta particles.
[electro- + -on]

Electron

One of the small particles that make up an atom. An electron has the same mass and amount of charge as a positron, but the electron has a negative charge.

electron (i·lekˑ·trn),

n the negatively charged particle that orbits around the nucleus of an atom.

e·lec·tron

(ĕ-lek'tron)
Negatively charged subatomic particles that orbit the positive nucleus, in one of several energy levels called shells. A nucleus and its electrons constitute an atom.
[electro- + -on]

electron (e) (ēlek´tron),

n a negatively charged elementary particle constituent in every neutral atom, with a mass of 0.000549. (Particles with an equal but opposite charge are called
positrons.)
electron beam,
n See electron stream.
electron stream,
n (electron beam, cathode ray, cathode stream), a stream of electrons emitted from the negative electrode (cathode) in a roentgen-ray tube; their bombardment of the anode gives rise to the roentgen rays.

electron

any of the negatively charged particles arranged in orbits around the nucleus of an atom and determining all of the atom's physical and chemical properties except mass and radioactivity. Electrons flowing in a conductor constitute an electric current; when ejected from a radioactive substance, they constitute the beta particles.

electron acceptor
see oxidant.
electron beam
the stream of electrons that flows from the anode to the cathode in the x-ray tube and then interacts with the tungsten target to produce x-rays.
electron carrier
a molecule associated with membrane-bound proteins that accepts and transfers electrons.
electron donor
electron micrographs
photographic images of electron microscopic fields.
electron microscope
see electron microscope.
electron microscopy
technology of using an electron microscope.
References in periodicals archive ?
Chapter Four 2009-2014 Global and China Market of Scanning Electron Microscope (SEM) 4.
Subject to the terms and conditions set forth in the Business Combination Agreement, the Business Combination will be effected through (1) the Tokyo Electron Merger of Tokyo Electron and the Tokyo Electron Merger Sub that will be incorporated by Tokyo Electron, and (2) the merger of Applied Materials and a company that will be incorporated by Applied Materials under the laws of the state of Delaware (the Applied Materials Merger ).
Mso, because a dot is often as small in diameter as the wavelength of an electron inside it, the dot immobilizes the electron.
If Geobacter could transfer electrons to electrodes as fast as it can to its natural electron acceptor, ferric iron, the rate of electron flow--that is, the current--could possibly be ten thousand times higher," says Lovley.
Usually this is done with one electron and one proton detector.
Both scanning electron and atomic force microscopy showed that the uninfected Vero cells were flat and without prominent form and surface (Figure 1).
The sample was microtomed and RuO4 stained and a Robinson electron backscatter detector was used to enhance contrast between the phases.
e]), the neutron beam polarization P, the electron velocity v/c and the experimental asymmetry X are measured or determined with a relative uncertainty better than [10.
Both rely on a regular supply of a toxic electron shuttle, which gets used up as it acts in the cathode.
v] are the outgoing electron and neutrino momenta, [[sigma].