Atomic model timeline

UNIVERSE DIES

1869 Dimitri Medeleev created the periodic table

1896 Henri Becquerel discovered radiation

1897 J.J.Thomson Determined the charge to mass ratio of electrons

1898 Rutherford Discovered alpha, beta and gamma rays in radiation.

1900 Frederik Soddy used the term ISOTOPE to explain the unintentionel breakdown of radioactive elements

1906 Hans Geiger Invented a device that could detect and measure alpha particles in an area

1922 Niels Bohr proposed an atomic model that stated the outer orbit of the atom could hold more electrons than the inner shells

1932 James Chadwick Using alpha particles discovered a neutral atomic particle with a mass close to a proton. From this experiment he discovered the neutron