1896- Antoine Henri Becquerel, a french physicist, discovered natural radioactivity.
1905- The Great German-born physicist Albert Enstein published his thoery that matter is a form of energy and that mass and energy are related.
1911- The british physicist Ernist Rutherford announced his discovery of the nucleus of the atom.
1932- James Chadwick, British physicist, discovered the nutron.
1938- The German radiochemists, Otto Hahm and Fritz Strassmann produced the elements berium and kryrtom by arding uraniun with nutrons.
1939- Austrian physicists Lise Meitner and Otto Frisch showed that Hann and Strassman had produced first known artificially created fission reaction.
1942- A groupe of scientists headed by the Italian-born physicist, Enrico Fermi produced the world's first artificial chain reaction at the University of Chicago. The achievement made possible the development ofg the atomic.
1945- The USA exploted the first atomic near Almogordo, New Mexico.
1946- Congeress established the atonic energy comission to control nuclear energy development in the US.
1952- US exploded the first hydrogen at Eniwetok, and therefore producedthe world's first large-scale fusion reaction.
1956- First Nuclear Power Plant began opporation in Calder Hall England.
1957- Un establish International Atonic Energy Agency to promotepeaceful use of nuclear energy. First plant opened in Shippingport, Pa.
1962- Canada's first nuclear power plant began producing electricity in Rolphton, Ontario.
1974- Congress divided the functions of AEC into ERDA and NRC.
1977- Congress abolish ERDA and transfer its fuctions to the newly created Department of Energy.