Atomic Theory Timeline

By lbreehl
  • 460


    Speculates about the world being made up of atoms.
  • Issac Newton

    Issac Newton
    Proposes that the world is made up of small bodies in motion.
  • John Dalton

    John Dalton
    Discovers that all particles are made up of atoms and are drawn togethers to form matter through the attraction of cohesion and affinity. Dalton also published the first six atomic weights to be given to elements. He explained why elements grouped together in whole ratios as well.
  • John Newlands

    John Newlands
    Published his law of octaves.
  • Johann Loschmidt

    Johann Loschmidt
    Measures molecules in the air, first time molecules or atoms given any dimension of how big or small they are.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Presents and publishes his periodic table in the order of their chemical properties which formed a pattern.
  • Goldstein

    Working with cathode rays and anode rays helped lead to the discoveries of the electron and the proton.
  • J.J. Thompson

    J.J. Thompson
    Discovers the electron while stuyding cathode rays, and helps develop the plum pudding model.
  • Rutherford

    Develops his theory of the atom which included a positive nucleus orbited by electrons. He discovered this through his experiments with gold foil and bombarding it with electrons.
  • Neils Bohr

    Neils Bohr
    Stated that electrons are in defined quantized orbits and could only move between the different orbits by absorbing energy quanta.
  • Frederick Soddy

    Frederick Soddy
    Discovered there were multipleatoms for each position on the periodic table. This lead to the term isotopes for different elements.
  • Max Planck

    Max Planck
    Discoveries about quanta help explain the different energy levels within the atom and how electrons move. Also lead to quantum mechanics.
  • Louis de Brogile

    Louis de Brogile
    Proposes that electrons and all particles have some form of wave like behavior.
  • Erwin Schrodinger

    Erwin Schrodinger
    Discovered that the movement of electrons could be modeled in an equation. Electrons move more like waves than particles. The equation is know called Schrodinger's equation.
  • James Chadwick

    James Chadwick
    Discovers the neutron through ionization testing.