Atomic Theory Timeline

By iciarrariley
  • 300

    Demacritus

    Discovered that atoms are small and invisiable to the human eye.

  • Antoine Lavoisier

    He established the law of conservation of mass . He founded a list of elements too.

  • joseph Louis Proust

    He found the composition of salt. He discovered that it always contained the same weight ratios.

  • John Dalton

    He ombined atom A with atom B and he also set atomic weights.

  • Dmitri Mendeleev

    He published the perodic table as Princples of Chemistry with 63 elements.

  • Eugene Goldstein

    Discovered cahode ays could produce sharp shadows.

  • Marie Curie

    She discovered new radioactive elements.

  • J.J Thomesen

    He theorized the cathode rays.

  • Earnest Rutherord

    Discovered radioativity scale. He also discovered the protron and nucular physics.

  • Robert Millikan

    Oil drop experiment. Measured electron charges.

  • Niels Bohr

    Discovered the Planetary model. Atom is illistrated in the adjacent igure.

  • Henery Moseley

    Measured wavelegnths , positioning of elements on the periodic table.

  • James Chadwick

    Discovered the Neutron.

  • Erwin Schrodinger

    Provided theoritical basis for Niels Bohr. He also discovered the movement of an electron in an atom.

  • Lise Meitner

    Explained and named nuclear fision. Using Bohr's liquid drop.