History of Atoms

By ninja_pixie13
  • Period: 100 to

    History of Atoms

  • 400

    Democritus

    Democritus
    400 B.C
    He created the first atomic model and named it atomus.

  • John Dalton

    John Dalton
    Proposed an atomic theory with spherical solid atoms based on properties of mass that were measurable.

  • James Clerk Maxwell

    James Clerk Maxwell
    Proposed electric and magnetic fields filled the void.

  • J.J. Thomson

    J.J. Thomson
    Discovered the charge to mass ratio of of an electron. Also found out that "canal rays" were associated with the proton H +

  • Robert Millikan

    Robert Millikan
    Determined the charge and mass of an electron.

  • Ernest Rutherford

    Ernest Rutherford
    Nucleus was: very dense, very small, and posativley charged. Also assumed that the electrons were located outside of the nucleus.

  • Niels Bohr

    Niels Bohr
    Developed an explanation of atomic structure that goes with all of the elements on the perodic table.

  • Werner Heisenberg

    Werner Heisenberg
    Described atoms by means of formula. Also proposed the Principle of Indeterminancy which states that you can not know both the position and velocity of a particle.

  • Erwin Schrodinger

    Erwin Schrodinger
    Viewed electrons as a cloud and introduced "wave mechanics" as a mathematical model of the atom.

  • James Chadwick

    James Chadwick
    Using alpha particles he discovered a neutral atomic particle. Discovered the neutron.