atomic theory timeline

By jmiahjoseph
  • 400

    Democritus

    Democritus
    Discovery-Claimed that there was a smallest piece of matter; atomos. Model-atomic model

  • John Dalton

    John Dalton
    Discovery-Developed a 4-part atomic theory based on the research of scientists all over the world (Daltons atomic theory). Model-billiard ball model

  • Michael Faraday

    Michael Faraday
    Discovery- Studied the effect of electricity on solutions Experiment- Magnetic Field Induction Experiment

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Discovery- the properties of elements were periodic functions of the their atomic weights.

  • G.J. Stoney

    G.J. Stoney
    Discovery- Proposed that electricity was made of discrete negative particles he called electrons.

  • J.J. Thompson

    J.J. Thompson
    Discovery-mass of an electron Model-plum pudding model

  • Ernest Rutherford

    Ernest Rutherford
    Discovery-Neutrons Experiment-Gold Foil Model-nuclear model

  • H.G.J. Moseley

    H.G.J. Moseley
    Discovery- Used x-ray tubes to determine the charges on the nuclei of most atoms.

  • Neil Bohr

    Neil Bohr
    Discovery-the nucleus is made up of neutrons and protons Model- planetary model

  • James Chadwick

    James Chadwick
    Discovery-neutrons Model-Neutron model

  • Aristotle

    Aristotle
    Discovery- felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of that matter. Model-atomic model