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  • Protons have a positive (+) charge.
  • Neutrons have no charge.
  • Electrons have a negative (-) charge.
  • Proton and neutron are roughly the same size
  • Electrons are considerably smaller than protons or neutrons
  • Protons and neutrons have a relative Atomic Mass of 1
  • The mass of electrons is so small it is not included in calculations of an atom's mass.
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