Discovery of the Atomic Model

By ericacha

  • Isaac Newton

    Proposed a mechaniacal universe with small solid masses in motion.

  • John Dalton

    Proposed an "atomic theory" with spherical solid atoms based on measurable properties of mass.

  • J.J Thompson

    Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram.

  • J.J Thompson

    Studied "canal rays" and found they were associated with the proton H +

  • J.J Thompson

    thompson proposed that the electrons of an atom were embedded in a positively charged ball of matter. His picture of an atom was named the plum-pudding model because it resembled plum-pudding, a dessert consisting of a ball of cake with pieces of fruit in it.

  • Rutherford

    Studied radiations emitted from uranium and thorium and named them alpha and beta.

  • Albert Einstein

    Published the famous equation E=mc 2

  • Ernest Rutherford

    Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.

  • Jame Chadwick

    Using alpha particles discovered a neutral atomic particle with a mass close to a proton. This was discovered the neutron.