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Atomic Structure. Discovery of the electron In 1897, JJ Thomson, an English physicist began studying atomic structure using a cathode ray tube (see right). Thomson continued. How did the experiment work??

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Presentation Transcript
atomic structure
Atomic Structure
  • Discovery of the electron
        • In 1897, JJ Thomson, an English physicist began studying atomic structure using a cathode ray tube (see right)
thomson continued
Thomson continued
  • How did the experiment work??
      • Thomson deflected the cathode ray using an electrical field, resulting in the ray bending toward the positive pole, so……the ray had to be made of negative particles, called electrons
thomson conclusion
Thomson Conclusion
  • But I thought the atom was neutral???
    • It is!! Thomson knew that there must be a source of positive energy, but wasn’t quite sure how it fit in.
    • So he developed the first model of the atom (on right) which he called Plum Pudding
millikan and his oil drops
Millikan and his oil drops
  • Robert Millikan did some pretty neat experiments with oil drops to determine the mass of an electron to be 9.1 x 10-31 kg.
phase 2 ernest rutherford
Phase 2---Ernest Rutherford
  • Rutherford was a student of Thomson’s
  • Weaknesses of Thomson’s model
  • Rutherford tries to expand Thomson’s model to make it more complete
rutherford continued
Rutherford continued
  • In 1911, Rutherford designed an experiment to test Thomson’s theory called the gold foil experiment (see right)
more rutherford
More Rutherford
  • micro.magnet.fsu.edu/electromag/java/rutherford
enough rutherford already
Enough Rutherford, already!!
  • After all was said and done, Rutherford’s final model of the atom looked something like this
niels bohr
Niels Bohr
  • Knew Rutherford’s model couldn’t be completely correct or the electrons would crash into the nucleus
  • So he proposed the electron energy level model
finally the quantum theory
Finally! The Quantum Theory
  • Bohr’s model was very restrictive
  • Are atoms REALLY that well-behaved?
  • Louis de Broglie….wave or particles??
  • Walter Heisenberg and his uncertainty..
  • What is an orbital anyway??
last but not least
Last, but not least!!
  • So what does an atom actually look like?? (at least for now )