Atomic structure

  • Created by: RachelH
  • Created on: 16-03-14 15:07
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  • Atomic structure
    • The nucleus at the centre of an atom contains two types of particle, called protons and neutrons
      • Protons have a positive charge and neutrons have no charge
    • Electrons are tiny negatively charged particles that move around the nucleus
      • An atom has no overall charge because the number of protons is equal to the number of electrons and their chargers are equal and opposite
        • Proton +1 and electron -1
    • All atoms of an elements contain the same number of protons
      • This number is called the atomic number (or proton number) of the element
    • Elements are arranged in order of their atomic numbers in the periodic table
      • The atomic number is also the number of electrons in an atom of the element
    • The mass number is the total number of particles in the nucleus of an atom, so it is the number of protons plus the number of neutrons


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