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Electrons are subatomic particles with negligible mass that orbit around the nucleus of atoms. The mass of an electron is 9.10938 x 10-31 kg. A common symbol for an electron is e- ( which contains a negative charge). The electron’s antiparticle, which carries a positive electric charge, is called a positron or antielectron and is denoted using the symbol β-. Electrons exist outside of the surrounding atom nucleus.
An electron is a negatively charged subatomic particle that can be either bound to an atom or free. An electron that is bound to an atom is one of the three primary types of particles within the atom — the other two are protons and neutrons. Together, protons and electrons form an atom’s nucleus.