Atomic Theory Garrett Stack

  • 440


    In 440 BCE, Democritus belived that all atoms were the smallest thing, and that they were made up of the same substance.
  • Dalton

    He belived that all mater was made of atoms and that atoms were indestructable, all the atoms in an element are the same, coumpoundes were formed by mixing two different atoms, and a chemical reaction is the rearrangement of atoms. His model was billiard balls
  • Thomsons

    He discovered that atoms could be broken down and the existance of the electron. His model was the cathode ray tube expirement.
  • Rutherford

    Rutherford discovered that the center of an atom was posotive, and it was surrounded by negative electrons. Rutherford thought that the atom was mostly empty space. His most famous expiriment was the gold foil expiriment.
  • Chadwick

    In 1932, Chadwick discovered the existance of the nuetron. Chadwicks model was similar to Bohr's but with the existance of nuetrons.
  • Bohr

    Bohr thought that electrons travel in stationary orbits around the atom using angular momentum. He used the Bohr model also known as the Planetary model.