Topic 1 -Atomic structure and the periodic table


Atoms contain protons, neutrons and electrons

  • radius of about 0.1 nanometers
    The nucleus
  • middle of atom
  • contains protons and neutrons
  • positively charged
    The electrons
  • orbit the nucleus
  • negatively charged
  • virtually have no mass
    Number of protons = number of electrons
  • atoms are neutral
  • in an ion the number of protons doesn’t equal number of electrons
    Atomic number and mass number describe an atom
  • nuclear symbol = proton…


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