Atom

Atomic Theory Timeline

By nelldt
  • Democritus
    460 BCE

    Democritus

    he found that atoms are small, hard particles that are constantly moving and he thought that were "uncuttable".
  • Democritus Atom Model
    460 BCE

    Democritus Atom Model

    This is what Democritus atom for their time
  • John Dalton

    John Dalton

    He found out that atoms of different elements are different and atoms of the same elements are exactly alike. He also did experiments in combining elements and found elements combine in specific proportions.
  • John Dalton

    John Dalton

    He thinks it looks the same as Democritus
  • J.J Thomson

    J.J Thomson

    He conducted the cathode-ray tude experiment. His theory of the atomic structure lead to the "plum-pudding" model. He found that there are small, negatively charged particles inside an atom.
  • J.J Thomson

    J.J Thomson

    Found that their are positive and negative charges
  • Ernest Rutherford

    Ernest Rutherford

    He conducted the gold foil experiment and found most of an atom's mass is in the nucleus. also the electrons move in empty in the atom and atoms contain mostly empty space.
  • Ernest Rutherford atomic model

    Ernest Rutherford atomic model

    found that the positive elections are in one spot
  • Niels Bohr

    Niels Bohr

    Bohr found that electrons jump between levels from path to path. And he found that electrons travel in definite paths.
  • Bohr Atomic Model

    Bohr Atomic Model

    He thought that there were rings going around it.
  • Erwin Schrodinger and Werner Heisenberg Atomic model

    Erwin Schrodinger and Werner Heisenberg Atomic model

    they found that there is a cloud around the atom not rings
  • Erwin Schrodinger and Werner Heisenberg

    Erwin Schrodinger and Werner Heisenberg

    They found that electron paths cannot be predicted .And that electron are found in electron clouds, not paths