Atomic Model TimeLine

  • 427 BCE

    Plato

    Plato introduced the atomic theory in which ideal geometric forms serve as atoms, according to which atoms broke down mathematically into triangles, such as the form elements had the following shape.
  • 427 BCE

    Solar System Model

    Solar System Model
    This model was made by Plato
  • 400 BCE

    Democritus

    Democritus held a theory that everything is composed of atoms, which are physically, but not geometrically, invisible, that between atoms, there lies empty space.
  • 384 BCE

    Aristotle

    Aristotle thought that all materials on earth were not made of atoms, but of the four elements, earth, fire, air, and water. He believed all substances were made up of small amounts of these four elements of matter.
  • Robert Boyle

    His major contribution to the atomic theory was that he helped develop a definition of an element. He also helped people change the way they think about science.
  • Lavoisier

    Lavoisier found the total mass of products and reactants in a chemical reaction that is always the same.
  • John Dalton

    His most important contribute to science was that matter is composed of atoms of differing weights and combine in simple ratios by weight.
  • Solid Sphere of Billiard Ball Model

    Solid Sphere of Billiard Ball Model
    John Dalton discovered the Solid Sphere of Billiard Ball Model.
  • Dmitiri Mendeleev

    Mendeleev found that when all the known chemical elements were arranged in order increasing by atomic weight.
  • The Curies

    Marie and her husband Pierre Curie discovered Polonium and Radium and was awarded a Nobel Prize in physics and chemistry for her discovery of the two elements.
  • J.J. Thomoson

    Thomoson proposed a model of the atom as a sphere of positive matter with electrons positioned based on electrostatic forces.
  • Plum Pudding Model

    Plum Pudding Model
    J.J. Thomson made this model.
  • Albert Einstein

    Einstein mathematically proved the existence of atoms and helped revolutionize al the sciences through the use of statistics and probability.
  • Robert Millikon

    Millikon succeeded in precisely determining the magnitude of the electrons charge
  • Ernest Rutherford

    Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of Radioactive decay.
  • Neils Bohr

    Neils proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in a certain well defined quantities.
  • Henry G.J. Mosely

    Mosely demonstrated that the major properties of an element are determined by the atomic number, not by the atomic weight
  • Electron Cloud Model

    Electron Cloud Model
    Made by Werner and Erwin
  • Werner Heisenberg

    Werner developed a key piece of the quantum theory, the uncertainty principal, with profound implications.