- mass of an electron (me) = 9.2095 x 10-31 kg
- charge of an electron (-e) = -1.602177 x 10-19 C
- electron rest energy (mec2) = 0.511 MeV
- spin of an electron = +1/2 or -1/2
The antiparticle of the electron is called the positron.
Discovery of the ElectronIn 1974, G. Johnstone Stoney theorized the existence of a unit of charge. He coined the term electron to describe such a unit charge in 1894.
The electron was not discovered until 1897, when J.J. Thomson discovered the particle in his research with cathode ray tubes. It was not until 1909 when experimental physicist Robert Millikan calculated the electron's mass in his classic oil-drop experiment.