Atomic Theory Timeline

By Liz.Cranford
  • Period: 440 BCE to

    Atomic Theory Timeline

  • 440

    Democritus

    Democritus
    Greek Philosopher
    -Atoms constantly move
    -Atoms are "uncuttable."
    -Atoms are small, hard particles
  • 440

    Democritus Atomic Model

    Democritus Atomic Model

  • John Dalton

    John Dalton
    -All substances are made up of atoms
    -Atoms of different elements are different
    -Atoms of the same element are exactly alike
    -Elements combine in specific proportions
    -He conducting in experiments combining elements

  • John Dalton Atomic Model

    John Dalton Atomic Model

  • J.J. Thompson

    J.J. Thompson
    -He conducted the Cathode-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 Thompson

    J.J Thompson

  • Ernest Rutherford

    Ernest Rutherford
    British Chemist and Physicist
    -Atoms contain mostly empty space
    -Electrons move in empty space in the atom
    -He conducted the gold-foil experiement
    -Most of an atom's mass is in the nucleus
    -There is a small, dense, positively charged nucleus

  • Ernest Rutherford Atomic Model

    Ernest Rutherford Atomic Model

  • Niels Bohr

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

  • Niels Bohr Atomic Mode;

    Niels Bohr Atomic Mode;

  • Erwin Schrodinger and Werner Heisenberg

    Erwin Schrodinger and Werner Heisenberg
    -Electrons paths cannot be predicted
    -Electrons are found in electron clouds not paths

  • Erwin Schrodinger and Werner Heisenberg Atomic model

    Erwin Schrodinger and Werner Heisenberg Atomic model