Protons: positive charge, mass=1 atomic mass unit, found in the nucleus (with neutrons), determined by: atomic number, determines what type of element the atom is, Neutrons: no charge, same size as the proton, found in the nucleus (with protons), determined by: atomic mass-atomic number, Electron: negative charge, smallest of the sub-atomic particles, found outside of the nucleus, determined by: the number of protons,

Subatomic particles

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