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460
Democritus
Greek philosipher who discovered or hypothesized the atomic theory that every thing is made up of atoms. 460-370 B.C. -
John Dalton
John Dalton developed the first useful atomic theory of matter around 1803. In the course of his studies on meteorology, Dalton concluded that evaporated water exists in... -
Ernest Rutherford
Ernest Rutherford, 1st Baron Rutherford of Nelson OM PC FRS, widely referred to as Lord Rutherford, was a chemist (B.Sc. in chemistry and geology 1894, Canterbury College, he is creddited to discovering the proton. -
JJ Thomson
In 1897 in Cambridge, J J Thomson experimented on cathode rays. In Britain, physicists had argued these rays were particles, but German physicists disagreed, thinking the... -
Neils Bohr
Niels Henrik David Bohr was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel in 1922. -
Shrodinger and de Broglie
Identified the electron cloud model as the probable location of moving electrons. -
Chadwick
Accredited to discovering the neutron. -
Enrico Fermi
Fermi and his colleagues in Rome studied the results of bombarding uranium with neutrons in 1934. -
Nuclear Fission
In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts, often producing free neutrons and lighter nuclei, which may eventually produce photons. -
Cockroft and Walton
discovered how to split atoms. -
Atomic bomb
Bomb was dropped on Japan to end WW2. -
Induced Radioactivity
Induced radioactivity occurs when a previously stable material has been made radioactive by exposure to specific radiation. Most radioactivity does not induce other materials to become radioactive. -
Curie Family
In 1934, Irene Curie, the daughter of Pierre and Marie Curie, and her husband, Frederic Joliot, announced the first synthesis of an artificial radioactive isotope. They bombarded a thin piece of aluminum foil with -particles produced by the decay of polonium and found that the aluminum target became radioactive. Chemical analysis showed that the product of this reaction was an isotope of phosphorus.
