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1. Topic 1

   • Atoms
     • Nucleus
       • >In the middle of the atom
       • >It contains protons and neutrons.
       • >Has a positive charge
       • >Contains almost the whole mass of an atom
     • Protons
       • >The number of protons = the number of electrons
       • Relative mass= 1
       • Charge = +1
     • Electrons
       • Move around the nucleus on shells
       • Charge -1
       • Volume of the orbits determines the size of the atom
     • Atomic number and mass number
       • The nuclear symbol of an atom tells you its atomic and mass number
       • atomic number =number of protons