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Atomic Structure

By msarkis
  • 442

    Democritus

    Democritus
    442BC
    Democritus proposed the first idea of the atom; "by convention bitter, by convention sweet, but in reality atoms and void."
  • Period: 442 to

    Atomic Timeline

  • John Dalton

    John Dalton
    Proposed an atomic theory with spherical solid atoms based upon measurable properties of mass.
    - All matter is made up of atoms
    - Atoms of the same element are the same

  • Wilhelm Roentgen

    Wilhelm Roentgen
    Discovered the x-ray machine.

  • Max Planck

    Max Planck
    Planck created the quantum theory: energy is not emitted constantly, but in small packages called quantum.

  • Albert Einstein

    Albert Einstein
    Albert Einstein published the famous equation E=mc^2

  • Robert Millikan

    Robert Millikan
    Millikan performed the oil trap experiment, which determined the charge of an electron as negative.

  • Ernest Rutherford

    Ernest Rutherford
    Rutherford established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.