Atomic Model Timeline

By christmannemmaG
  • 500 BCE

    The Alchemists

    The Alchemists
    Alchemy was based off of belief that there were four major elements in nature: Air, water, fire and earth. They learned how to change basic substances into other substances.
  • 442 BCE

    Democritus

    Democritus
    Developed the atomic theory for the universe, his atomic theory anticipated the modern principles of the conservation of energy and irreducibility of matter.
  • 384 BCE

    aristotle

    aristotle
    Knowledge of natural science including physics, astronomy, meteorology, and plants and animals.
  • 350 BCE

    Plato

    Plato
    5 regular solids "platonic." He Solves that objects in the material world are all distinct.

  • Robert Boyle

    Robert Boyle
    Discovery that atoms must exist based on the relationship between pressure and volume of gas.

  • Lavoisier

    Lavoisier
    Lavoisier was the founder of modern chemistry. Clarified concept of an element as a simple substance that could not be broken down by any known method of chemical analysis and he devised a theory of the formation of chemical compounds from elements.

  • John Dalton

    John Dalton
    Developed atomic theory. Matter is composed of differing weights and combine in simple ratios in weight. John dalton also created the solid sphere of billiard ball model as seen in the picture.

  • Dimitri Mendeleev

    Dimitri Mendeleev
    The resulting table displayed a recurring pattern.

  • Ernest Rutherford

    Ernest Rutherford
    Found 2 types of radiation, alpha and beta. He created the solar system model. Also found that the atom consits of mostly empty space.

  • J.J. Thomson

    J.J. Thomson
    Discovered the electron. Revolutionized the atomic model. Created the plum pudding model.

  • The Curies

    The Curies
    Found that atoms are radioactive! Her theory allowed her to see how radioactive each elements are.

  • Robert Millikan

    Robert Millikan
    Experiements to determine the electric charge carried by a single electron.

  • Henry G.J. Mosely

    Henry G.J. Mosely
    Properties of the element are determined by the atomic number not by atomic weight.

  • Neils Bohr

    Neils Bohr
    Proposed the model of the atom.

  • Neils Bohr

    Neils Bohr
    explains the rydberg formula, proposed the model of the atom.

  • Albert Einstein

    Albert Einstein
    Albert Einstein was behind the making f the atomic bomb. The atomic bomb was created by spitting an atom by dropping a particle on the nucleus of an atom.

  • Werner Heisenberg

    Werner Heisenberg
    Discovery of uncertainty principle.