Events
UNIVERSE DIES1869 Dimitri Medeleev
created the periodic table1896 Henri Becquerel
discovered radiation1897 J.J.Thomson
Determined the charge to mass ratio of electrons1898 Rutherford
Discovered alpha, beta
and gamma rays in radiation.1900 Frederik Soddy
used the term ISOTOPE
to explain the unintentionel
breakdown of radioactive elements1906 Hans Geiger
Invented a device that
could detect and measure
alpha particles in an area1922 Niels Bohr
proposed an atomic model
that stated the outer orbit
of the atom could hold more
electrons than the inner shells1932 James Chadwick
Using alpha particles discovered
a neutral atomic particle with a
mass close to a proton. From
this experiment he discovered
the neutron
Comments