Radioactivity

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  • Radioactivity
    • Atoms and Radiation
      • Geiger counters are used to detect radioactivity
      • Rutherford
      • Gold foil experiment
        • Alpha Radiation is stopped by paper
          • This means that every atom has a positively charged nucleus at the center which contains most of the mass of the atom.
            • He proved, using the gold foil experiment, that some some alpha particles that where being directed towards foil rebounded.
        • Beta Radiation goes through paper
        • Gamma radiation was later discovered and was even stronger than Beta
      • He proved, using the gold foil experiment, that some some alpha particles that where being directed towards foil rebounded.
      • An unstable nucleus is when it decays whilst emitting radiation.
      • Video clip :
    • The discovery of the nucleus
      • plum pudding model
        • before this, they didn't know that atoms contain negatively charged particles called electrons.
        • this theory was that there were positively charged matter spread about with electrons buried inside.
      • Bohr's model of the atom
        • the theory that electrons in the atom orbit the nucleus at specific distances & specific energy levels.
      • Rutherford's theory
        • he deduced that there is a positively charged nucleus at the center of every atom that is:
          • smaller than the atom
          • where most of the mass is located
    • Changes in the nucleus
    • Alpha, Beta, Gamma radiation
    • Activity and half - life
    • Nuclear fission
    • Nuclear Fusion
    • Nuclear issues

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