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The negatively charged electron is an elementary particle, it hardly has any mass and moves around the positive atomic nucleus. Its symbol is e-.

Tab.1
Electric chargee1.60210-19C
NAe98.487C
Specific electric chargee/me1.7589108C/g
Invariant massme9.109110-28g
Molecular massNAme5.486910-4g/mol
Radiusre210-13cm

A more exact characterization of electrons and their movements are an integral part of the various atomic models.