AQA Revision Notes - C2

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Subatomic Particles

  • Atoms have a small central nucleus made up of protons and neutrons.
  • Nucleus surrounded by electrons.
  • Protons have a positive charge [+1].
  • Electrons have a negative charge [-1].
  • Atoms of different elements have different numbers of protons (also known as atomic number).
  • Atomic number is the number of protons.

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