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  • The number of protons in the nucleus of the atom is equal to the atomic number (Z)
  • The number of electrons in a neutral atom is equal to the number of protons.
  • The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons
  • The atomic number of a chemical element is the number of protons found in the nucleus of an atom of that element
  • If you know the mass number and atomic number of the atom, the number of neutrons is just the difference between them.
  • Protons are positively charged atoms. Electrons are negatively charged atoms. Neutrons has no charge
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