The definition of electron

1 Definitions of: electron

1. noun, a stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element in the neutral atom; a lepton with a negative charge of 1.602 176 462 ✕ 10^–19 coulomb, a rest mass of 9.109 381 88 ✕ 10^–31 kilogram, a radius of 2.817 940 285 ✕ 10^–15 metre, and a spin of ½
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