electron (e-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, e.'s are called beta particles. [electro- + -on]
Auger e. an e. ejected from a lower energy orbital after a photoelectric interaction of an x-ray photon with a K-shell e. by the characteristic radiation photon; the Auger e. recoils with energy equal to the characteristic radiation less the difference in shell binding energies. See photoelectric effect.
conversion e. an internal conversion e.
emission e. a beta particle resulting from radioactive decay.
internal conversion e. an e., similar to an Auger e., released from one of the e. orbits of the atom upon activation by a gamma-ray from that atom's nucleus; the e. has kinetic energy equal to the net energy transition of the disintegration.
positive e. positron
transition e. an e. that moves from one energy level to another to fill a vacancy in a shell, with the emission of characteristic radiation.
valence e. one of the e.'s that take part in chemical reactions of an atom.


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