why mass of electron is constant
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Electron rest mass. The electron restmass (symbol: me) is the mass of a stationary electron. It is one of the fundamental constants of physics and is also very important in chemistry because of its relation to the Avogadroconstant.
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, whose electric charge is negative one elementary charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electronhas a mass that is approximately 1/1836 that of the proton.
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