Atomic Theory Timeline Project

By culpae
  • 400 BCE

    Democritus

    Democritus
    He though that atoms are tiny, uncuttable, solid particles that are surrounded by empty space and constantly moving.He conducted in combining elements.

  • John Dalton

    John Dalton
    He proposed that all substances are made of atoms.Atoms of the same element are exactly alike.Atoms of different elements are different.Elements combine in specific proportions.

  • Erwin Schrödinger and Werner Heisenberg

    Erwin Schrödinger and Werner Heisenberg
    Electrons are found in electron clouds, not paths.Electrons jump between levels from path to path.Electron paths cannot be predicted.

  • Ernest Rutherford

    Ernest Rutherford
    He conducted the gold foil experiment.There is a small, dense, positively charged nucleus.Electrons move in empty space in the atom.

  • Niels Bohr

    Niels Bohr
    Electrons travel in definite paths.

  • J.J Thomson

    J.J Thomson
    He conducted the cathode-ray experiment.His theory of the atomic structure lead to the "plum-pudding" model.