atomic theory

By stoutzenbergerig
  • 440 BCE

    Democritus

    Democritus
    -Atoms are "uncuttable"-

    atoms are small, hard, particles

    -atoms constantly move-
  • 440 BCE

    Democritus

    Democritus
    atomic model

  • John Dalton

    John Dalton
    atomic model

  • John Dalton

    John Dalton
    -all substances are made of atoms- atoms of different elements are different- atoms of the same element are exactly alike- elements combine in specific proportions- he conducted experiments in combining elements-

  • J.J. Thomson

    J.J. Thomson
    -He conducted the cathode-ray tube experiment- his theory of the atomic structure lead to the "plum-pudding" model- there are small, negatively charged particles inside an atom-

  • J.J. Thomson

    J.J. Thomson
    Atomic Model

  • Ernest Rutherford

    Ernest Rutherford
    -Atoms contain mostly empty space- he conducted the gold foil experiment-most of an atom's mass is in the nucleus- there is a small, dense, positively charged nucleus-

  • Ernest Rutherford

    Ernest Rutherford
    atomic model

  • Niels Bohr

    Niels Bohr
    atomic model

  • Niels Bohr

    Niels Bohr
    -electrons jump between levels from path to path- electrons move in empty space in the atom- electrons travel in definite paths-

  • Erwin Schrodinger & Werner Heisenberg

    Erwin Schrodinger & Werner Heisenberg
    -electron paths cannot be predicted- electrons are found in electron clouds, not paths-

  • Erwin Schrodinger & Werner Heisenberg

    Erwin Schrodinger & Werner Heisenberg
    Atomic Model