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The three subatomic particles in an atom are protons, neutrons, and electrons:

  • Protons have a relative mass of 1 and a charge of +1, and they are found in the nucleus of an atom.
  • Neutrons have a relative mass of 1 and no charge, and they are also found in the nucleus of an atom.
  • Electrons have a relative mass of 1/1836 and a charge of -1. They are found in specific orbits around the nucleus and are held in these orbits by the positive charge of the protons in the nucleus.
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