History of Atoms

By Haley.johnson
  • 400 BCE

    Democritus

    Democritus
    First to suggest Atoms were tiny indestructible beings
  • Period: 400 BCE to

    History of Atoms

  • John Dalton

    John Dalton
    All matter is made of atoms that are invisible and indestructible

  • Dmitri mendeleev

    Dmitri mendeleev
    First to use trends in the periodic table to predict properties of missing elements.

  • Eugene Goldstein

    Eugene Goldstein
    Discovered protons by using cathode rays and attracting them to a positive charge

  • J.J. Thomson

    J.J. Thomson
    used a crookes tube to demonstrate cathode rays are negatively charged.

  • Max planck

    Max planck
    originated the quantum theory

  • Robert Millikan

    Robert Millikan
    oil drop experiment helped quantify the charge of an electron

  • Nielso Bohr

    Nielso Bohr
    THeory that energy is only transferred in well defined quantities

  • Erwin Schrodinger

    Erwin Schrodinger
    Used mathematical equations to describe the likelihood of finding an atom in a certain position

  • James chadwick

    James chadwick
    used beryllium with alpha particles causing radiation and discovering neutrons.

  • werner Heisenberg

    werner Heisenberg
    Found the uncertainty principle and quantum mechanics

  • Ernest Rutherford

    Ernest Rutherford
    used the gold foil experiment to show the nucleus is tiny and heavy