Discovery of the Atom


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  • John Dalton (1804) - Atoms make up all matter. - Atoms are solid. - Atoms can not be divided, created, or destroyed.
  • J.J. Thomson (1904) - Plum pudding model - Negative charge (electrons) spread out in a "sea' of positive charge. - Cathode Ray Tube Experiment
  • Ernest Rutherford (1909) - Discovered the nucleus - Positive charge in the center - Atoms are mostly empty space - Gold foil experiment
  • Niels Bohr (1913) - Electrons orbit around the nucleus. - Based on the energy the electron has - Flame test & atomic emission test
  • Quantum Model " Modern Model " (1926) -Electrons are in "clouds" called orbitals -Location based on probability
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