History of the Atom Timeline by Michael Guillot and Jon Burrell

By michael.guillot2018

  • Democritus (460B.C.)

    Democritus (460B.C.)
    He discovered the atom and that it can't be broken.
    The method he used was the Cathode-Ray tube experiment.
    He thought it looked like a round sphere with no electrons, protons, or neutrons.

  • Dalton

    Dalton
    He discovered that all atoms are identical and that they make up the element that have the same mass.
    The method he used was the Atomic Theory.
    He thought it looked like tiny invisibly, indestructable particles.

  • Thomson

    Thomson
    He discovered that electrons exist.
    The method he used was that he placed Cathode tubes in electric and magnetic fields.
    He thought it looked like an invisible sphere with electrins in it.

  • Bohr

    Bohr
    He discovered energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another.
    The method that he used was Plum Pudding.
    He thought it looked like a ball of positive charged.
  • Period: to

    History of the Atom Timeline

  • Rutherford

    Rutherford
    He doscovered that the atom had a nucleus. He was first to split the atom.
    The method that he used was deflection in a magnetic field and obtained the magnitudes of the deflections.
    He thought it looked like an electric cloud.

  • Heisenberg and Schrodinger

    Heisenberg and Schrodinger
    They discovered atoms had a nucleus, Alpha particles, tiny particles, changed particles much smaller than an atom.
    They used the gold foil experiment.
    They thought the atoms looked like the solar system.