Old Dudes Time Line Project

Timeline created by jenjenshen
  • Period: 350 to

    Contributions to the Field of Chemistry

  • 460

    Democritus - 460 B.C

    Democritus -  460 B.C
    Developed the idea of atoms in a void.
  • Medieval Alchemy

    Medieval Alchemy
    Developed the idea of "Corpuscles" that were subject to attractive and repulsive forces.
  • John Dalton

    John Dalton
    Proposed a modern atomic model based on experimentation not on pure reason.
  • Henri Becquerel

    Henri Becquerel
    Discovered that X-rays excite fluorescence in certain substances
  • Neils Bohr

    Neils Bohr
    Link-Formulated the ‘complementarity principle’
    -Made major contributions to the work on radioactivity that led to the discovery and exploitation of nuclear fission
    -created the liquid-drop model of the nucleus
  • J.J Thompson

    J.J Thompson
    Discovered Electrons and created the Raisin Pudding Model
  • Marie and Pierre Curie (1867 & 1856)

    Marie and Pierre Curie (1867 & 1856)
    They established that the heavy element thorium was radioactive and discovered two new elements: polonium and radium. They refined techniques for extracting radium from ores.
  • Ernest Rutherford

    Ernest Rutherford
    Shot alpha (α) particles at gold foil and discovered that a “nucleus” is positive & holds most of an atom’s mass.
  • James Chadwick

    James Chadwick
    LinkProved that neutrons, neutral particles in the nucleus that made up approximately half the mass of an atom, did exist