electron

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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 ?
The surface amounts of the carbon fraction within the O--C-O groups for CMOX increased in comparison with the nonmodified OX film sample by about 225% and within the C-OH groups by about 34%, which had an influence on the increase in the electron donor contribution of its SFE by about 270%.
The supramolecular system participating in electron transfer can be expressed by A-L-B, where A and B are electron donor and electron acceptor respectively in electron transfer process and L is the "bridge" or coupling unit between A and B.
An electron donor (reduced compound) and an electron acceptor (oxidized compound) are needed.
value, this suggests that in contrast to the apolar surface of the raw fabric the pretreated cotton fabrics can be described as monopolar surfaces with a strong electron donor capacity.
Triphenyl phosphite (TPP) was used as an electron donor material.
As water flows along the outside of the hollow fibers, hydrogen is diffused from the bore of the fiber outwards, acting as an electron donor to promote the growth of bacteria that naturally occur in the water.
The winning project used CDM's innovative, patented Gaseous Electron Donor Injection Technology (GEDIT) and demonstrated that indigenous bacteria in soil will consume perchlorate and nitrate in the presence of injected hydrogen gas.
Already, a semiconducting device has been fabricated by overlaying alternate LB layers of an electron donor compound and an electron acceptor.
Of the aqueous molecules, the best known is vitamin C (ascorbate), which is the most powerful electron donor and the first plasma antioxidant to be sacrificed upon exposure to oxidative stress (11).
2 [micro]mol fenthion or fenthion sulfoxide, 1 [micro]mol of an electron donor and liver microsomes (2-3 mg protein) or cytosol (1-2 mg protein) in a final volume of 1 mL of 0.
The metabolic reductive dechlorination pathway (chlororespiration) is a strict anaerobic process that requires an electron donor (i.

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