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Atomic Theory

By Keira&Haleigh
  • 440

    Democritus

    Democritus
    •Atoms are small, hard particles.
    •Atoms constantly move.
    •Atoms are "uncuttable".

  • Dalton

    Dalton
    •Atoms of different elements are different.
    •Elements combine in specific proportions.
    •Atoms of the same element are exactly alike.
    •He conducted experiments in combining elements.
    •All substances are made of atoms.

  • Thompson

    Thompson
    •He conducted the cathode ray tube experiment.
    •There are small, negatively charged particles inside an atom.
    •His theory of atomic structure led to the "plum pudding" model.

  • Rutherford

    Rutherford
    •Most of an atoms mass is in the nucleus.
    •Electrons move in empty space in the atom.
    •There is a small, dense, positively charged nucleus.
    •He conducted the gold foil experiment.
    •Atoms contain mostly empty space.

  • Bohr

    Bohr
    •Electrons travel in definite paths.
    •Electrons jump between levels from path to path.

  • Erwin Schrödinger & Werner Heisenberg

    Erwin Schrödinger & Werner Heisenberg
    •Electron paths can not be predicted.
    •Electrons are found in electron clouds, not paths.