Electron

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

---

e·lec·tron (-lktrn)

n. Abbr. e

A stable subatomic particle in the lepton family having a rest mass of 9.1066 × 10^-28 gram and a unit negative electric charge of approximately 1.602 × 10^-19 coulomb. Also called negatron.

---

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.

Mentioned in: Electrolyte Supplements, Positron Emission Tomography

---

electron (i·lekˑ·trn),

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

---

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

see reductant.

electron micrographs

photographic images of electron microscopic fields.

electron microscope

see electron microscope.

electron microscopy

technology of using an electron microscope.