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Electrons also exist independently and are responsible for many electric effects in materials.
Due to their small mass, the wave properties and relativistic effects of electrons are marked. The positron , the antiparticle of the electron, is an equivalent particle but with positive charge. Either electrons or positrons may be emitted in b-decay. Electrons, muons, the tau and neutrinos form a group of fundamental particles called leptons . They offer to buy or sell new and used college textbooks.