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As the symbol e is used for the elementary charge, the electron is commonly symbolized by e−, where the minus sign indicates the negative charge.

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Mass and charge of electron and positron
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As the symbol e is used for the elementary charge, the electron is commonly symbolized by e−, where the minus sign indicates the negative charge.
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https://en.wikipedia.org/wiki/Electron#Fundamental_properties
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The invariant mass of an electron is approximately 9.109×10−31 kilograms, or 5.489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV.
Electrons have an electric charge of −1.602176634×10−19 coulombs, which is used as a standard unit of charge for subatomic particles, and is also called the elementary charge.
Within the limits of experimental accuracy, the electron charge is identical to the charge of a proton, but with the opposite sign.
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The positron is symbolized by e+ because it has the same properties as the electron but with a positive rather than negative charge.
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