Fea atom model

Atomic Model Timeline

By markgart
  • 500 BCE

    The Alchemists

    Developed a theory that all metals are composed of mercury and sulfur and that it is possible to change base metals into gold.
  • 450 BCE

    Aristole

    Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter
  • 442 BCE

    Democritus

    Democritus is an ancient Greece philosopher who first used the word atom. Democritus created the theory of the atom and he concluded the atom is made up of the invisible particles called atoms.
  • 387 BCE

    Plato

    His contribution and the development to the atomic theory was his idea of the possibility of an atomic mass.

  • Robert Boyle

    Robert Boyle
    Robert Boyle FRS was an Anglo-Irish natural philosopher, chemist, physicist, and inventor. Boyle is largely regarded today as the first modern chemist, and therefore one of the founders of modern chemistry, and one of the pioneers of modern experimental scientific method.

  • lavoisier

    lavoisier
    The modern atomic model was first developed by two key scientists. Lavoisier and Dalton with the help of some others. They formulated the key concepts of the law of conservation and mass and the existence of the building blocks of all matter using their knowledge of chemical reactions.

  • JJ Thomson

    JJ Thomson
    An English physic who helped revolutionize the knowledge of atomic structure by his discovery of the electron. He also made the plum pudding model which was A huge thing from back then and even now.

  • Demetri Mendeleev

    Demetri Mendeleev was a Russian chemist and inventor. He is best remembered for formulating the periodic law and created a farsighted version of the periodic table of elements.

  • John Dalton

    John Dalton
    The Billard Ball model. Because Dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billard pool balls, so he used wooden balls tomodel them

  • The Curies

    The Curies worked together investigating radioactivity. They discovered Two elements (Radium and Palonium).

  • Albert Einstein

    Albert Einstein
    In 1905 Albert Einstein published an analysis in which he devised a mathematical way to predict the size of both atoms and molecules

  • Ernest Rutherford

    Rutherford fired alpha particles at foil, He discovered that an atoms mass is in the nucleus which developed the nuclear model.

  • Neils Bohr

    Neils Bohr
    Neils Bohr proposed a theory for hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only prescribed orbits. When jumping from orbit to another with lower energy, a light quantum is emitted.

  • Henry. G. J. Mosely

    He was an English physic who developed the x- ray spectum.

  • Robert Millikan

    His oil drop experiment helped to quantify the charge of an electron, which contributed greatly to our understanding of the structure of the atom and the atomic theory.

  • Werner Heisenberg

    A German Theoretical physicist and 1932 Nobel prize winner. Heisenberg was a main contributor to the German atomic program during WW II, in direct competition with the Manhattan project.