Atomic Theory

By bigD2003
  • Period: 500 BCE to

    Atomic Theory

  • 400 BCE

    Democritus

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

    Democritus Atom

    Democritus Atom

  • 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.
    Conducted experiments in combining elements.

  • Dalton Atom

    Dalton Atom

  • J.J Thomson

    J.J Thomson
    Conducted the cathode-ray tube experiment.
    Theory of the atomic structure lead to "plum pudding model".
    There is a small, dense, negatively charged particles inside an atom.

  • J.J Thomson Atom

    J.J Thomson Atom

  • Ernest Rutherford

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

  • Rutherford Atom

    Rutherford Atom

  • Niels Bohr

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

  • Bohr Atom

    Bohr Atom

  • Schrodinger and Heisenberg

    Schrodinger and Heisenberg
    Electron paths can not be predicted.
    Electrons are found in electron clouds, not paths.

  • Schrodinger and Heisenberg Atom

    Schrodinger and Heisenberg Atom