Atom Timeline

  • Democritus
    400 BCE

    Democritus

    Created the theory of atoms existence
  • Dalton

    Dalton

    Confirmed everything is created by atoms
  • Mendeleev

    Mendeleev

    Created the periodic table
  • Goldstein

    Goldstein

    Discovered positive particles in atoms
  • Thomson

    Thomson

    Discovered the electron
  • Rutherford

    Rutherford

    Discovered the common model of an atom
  • Millikan

    Millikan

    Discovered how to determine the charge of electrons
  • Bohr

    Bohr

    Discovered that electrons orbited nuclei in atoms
  • Planck

    Planck

    Created the quantum theory
  • Heisenberg

    Heisenberg

    Created the Uncertainty Principle:
    -You can never know the exact location of an electron
    -You can never know the exact amount of energy it produces
  • Chadwick

    Chadwick

    Discovered neutrons in an atom
  • Schrodinger

    Schrodinger

    Created an equation for tracking electron movements