Thought matter was indivisible “atomos”

By landinbrown
  • Thought matter was indivisible “atomos”
    450 BCE

    Thought matter was indivisible “atomos”

    Democritus
  • Proposed the Law of Conservation of mass

    Proposed the Law of Conservation of mass

    Antoine Lavoisier
  • roposed the Law of Definite Proportions

    roposed the Law of Definite Proportions

    Joseph Proust
  • Proposed the first Atomic Theory

    Proposed the first Atomic Theory

    John Dalton
  • Discovered Cathode Rays and the Cathode Ray tube

    Discovered Cathode Rays and the Cathode Ray tube

    William Crookes
  • Published the FIRST periodic table

    Published the FIRST periodic table

    Dmitri Mendeleev
  • Organized the periodic table by atomic number

    Organized the periodic table by atomic number

    Henry Moseley
  • Discovered the phenomenon of natural radioactivity

    Discovered the phenomenon of natural radioactivity

    Henri Becquerel
  • Performed the Cathode Ray Tube Experiment

    Performed the Cathode Ray Tube Experiment

    J.J. Thomson
  • Discovered electrons’ mass & charge

    Discovered electrons’ mass & charge

    J.J Thompson
  • Discovered the electron

    Discovered the electron

    J.J Thompson
  • Proposed the Plum pudding model of the atom

    Proposed the Plum pudding model of the atom

    J.J Thompson
  • Discovered two elements, Po and Ra

    Discovered two elements, Po and Ra

    Marie Curie
  • Performed the Gold foil Experiment

    Performed the Gold foil Experiment

    Ernest Rutherford
  • Performed the Oil Drop Experiment

    Performed the Oil Drop Experiment

    Robert Millikan
  • Discovered the nucleus

    Discovered the nucleus

    Ernest Rutherford
  • Proposed the planetary or solar system model of the atom

    Proposed the planetary or solar system model of the atom

    Niels Bohr
  • Proposed the electron cloud model of the atom

    Proposed the electron cloud model of the atom

    Werner Heisenburg
  • Discovered the neutron

    Discovered the neutron

    James Chadwick