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1. Atoms

   • All substances are made up of atoms
   • They are 0.1 nanometers (1x10^-10m)
   • They are made up of Protons (Positive subatomic particles), Electrons (Negative subatomic particles) and Neutrons (Neutral subatomic particles)
   • The Nucleus is at the Centre of the atom and contains protons and neutrons
   • Electrons go Around it in shells, they have almost no mass and the volume of their orbits determines the size of the atom
   • Atoms are neutral which means that they have the same amount of protons as electrons
   • Symbols
     • The Atomic number is the amount of protons in that element
     • The Atomic Mass Number is the total of Protons and Neutrons

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