Atom Scientists Timeline

By Ethan.Skinner
  • 350

    Aristotle

    Aristotle
    B.C
    No one argued, because he tutored famous people. All things made up of water earth air and fire.
  • 400

    Democritus

    Democritus
    B.C
    everything made of atoms
  • 550

    Parmenides

    Parmenides
    B.C
    Everything made up of building blocks

  • John Dalton

    John Dalton
    Dalton's Atomic Theory
    1.All elements composed of indivisble atoms
    2.Atoms of same elemnt are the same. Atoms from different elements are different.
    3.Atoms make compounds
    4.Atoms rearranged in chemical reactions. Not created or destroyed

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Periodic Table, sorted elements by weight, left gaps for undiscovered elements

  • JJ Thompson

    JJ Thompson
    Discovered Electrons with Cathode Ray Tube

  • Millikan

    Millikan
    found charge and mass of electron
    Plum Pudding Model

  • Ernest Rutheford

    Ernest Rutheford
    Positive nucleus with electrons around. Nucleus tiny and dense.

  • Niels Bohr

    Niels Bohr
    Electrons orbitted in rings, or energy levels. Could jump levels to emit energy.

  • Chadwick

    Chadwick
    Discovered Neutron because masses weren't makins sense.

  • Manhatten Project

    Manhatten Project
    Atomic energy research. Asked to create the atomic bomb. Successfuly split an atom, releasing the energy contained within. Disproved Bohr.