Atomic Scientist

Timeline created by elizabeth_osondu
  • 460

    Democritis

    Democritis
    He first proposed the existance of an ultimate particle.
  • John Dalton (1766-1844).

    John Dalton (1766-1844).
    Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Proposed the perodic law asnd developed the first periodic table
  • John (J. J.) Thomson

    John (J. J.) Thomson
    Studied "canal rays" and found they were associated with the proton H+ .
  • Robert Milikan

    Robert Milikan
    Determined the unit of charge of the electron
  • Ernest Rutherford

    Ernest Rutherford
    publishes his atomic theory describing the atom as having a central positive nucleus surrounded by negative orbiting electrons.
  • Henri Moseley

    Henri Moseley
    Discovered Moseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms.
  • Heisenberg

    Heisenberg
    He is best known for his uncertainty principle, which restricts the accuracy with which some properties of atoms and particles--such as position and linear momentum--can be determined simultaneously
  • James Chadwick

    James Chadwick
    discovered a third type of subatomic particle, which he named the neutron.
  • Erwin Schrodinger

    Erwin Schrodinger
    Edwin Schrodinger stated that rather than electrons being distributed within an electron configuration of shells and energy levels, they were arranged in orbitals which were systematically distributed within Electron Clouds.