Adrian Singletary

  • 450


    Proposed that matter exists in the form of a particle
  • John Dalton

    Proposed the atomic theory based on measured masses
  • Dmitri Mendeleev

    Created the first periodic table
  • Ernest Rutherford

    Found that the nucleous was small, dense , and positivley charged
  • William Crookes

    Discovered that cathode rays travel in straight lines, and made Crookes tube
  • JJ Thomson

    Discovered the electron
  • Ernest Rutherford

    Alpha particles are doubly ionized helium atoms
  • Niels Bohr

    Atoms have orbital shells with electrons
  • James Chadwick

    Discovered the neutron