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Atomic model timeline
26 Oct 2017
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
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