Atom rutherford1

chandler carson

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    BCE..first composed matter exists in forms of particles
  • John Dalton

    proposed atomic theory
  • Dmitri Mendeleev

    created first periodic table with elements divided into 7 groups.
  • Ernest Rutherford

    discovered half-life of radioactive elements. Established nucleus was small and dense.
  • William Crookes

    discovered cathode rays travel in straight lines.
  • JJ Thompson

    Discovered electrons using crookes tube.
  • Neils Bohr

    created bohr model of atom which shows electrons outside nucleus.
  • James Chadwick

    Discovered the electron.