Electron
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Electron
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The subatomic
particle that possesses the smallest possible negative electric charge
(4.80298 * 10-10 electrostatic units). See physical
constants, table.
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The mass of the electron is approximately equal to 1/1836 that of a
hydrogen atom; its theoretical rest mass
(symbol me) is equal to 9.109 3897(54) * 10-31
kg and its rest energy is equal to 0.510 999 06(15) million
electron-volt. The charge-to-mass ratio for the electron (symbol
e/me) is 1.758796 cc� / g�.
The
term electron is usually reserved for the orbital or extranuclear
particle, whereas the term beta particle refers to a nuclear electron.
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*The numbers in bold type were taken from the 1987 publication of
Fundamental Physical Constants: 1986 CODATA (Committee on Data for Science
and Technology of the International Council of Scientific Unions) Recommended
Values issued by the U. S. Department of Commerce, National Bureau of
Standards.
"Digits in parentheses represent one standard deviation
uncertainty in the final digits of the given value, based on a least-squares
analysis with five variables and 17 degrees of freedom." [[/a>|/a>]]
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
