History of Atom

By 21schauerem
  • 370 BCE

    Democritus

    Democritus
    First to suggest the system of atoms

  • John Dalton

    John Dalton
    Theory of all matter was made of atoms

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Created the first periodic table

  • Eugene Goldstein

    Eugene Goldstein
    Discovered protons with the experiments of cathode rays that would knock electrons of atoms and charge them to a positively charged electron

  • J.J Thomson

    J.J Thomson
    Discovered the electron

  • Max Planck

    Max Planck
    Originator of the quantum theory

  • Robert Millikan

    Robert Millikan
    Oil drop experiment helped to quantify the charge of an electron which contributed to our understanding of the structure of an atom

  • Ernest Rutherford

    Ernest Rutherford
    Demonstrated that the atom has a heavy nucleus

  • Niels Bohr

    Niels Bohr
    Said the hydrogen atom based on quantum theory, that energy is transfered in certain quantities

  • Erwin Schrodinger

    Erwin Schrodinger
    Used mathematic equations to describe the likelihood of finding an electron in a certain position

  • James Chadwick

    James Chadwick
    Discovered the neutron

  • Werner Heisenberg

    Werner Heisenberg
    Theory of quantum mechanics