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2. The total number of protons and neutrons in the element.

  • weight number
  • mass number
  • atomic number

3. The number that shows the amount of protons (and electrons) in an element.

  • atom number
  • atomic number
  • mass number

4. Positively charged particle.

  • electron
  • proton
  • neutron

5. neutral (or no charge) particle.

  • electron
  • neutron
  • proton
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