1900
Frederick Soddy observes spontaneous disintegration of radioactive elements into variants he calls "isotopes".
1902
Rutherford and Soddy publish theory of radioactive decay.
1903
Becquerel shares Nobel Prize for Physics with Pierre and Marie Curie for 1898 discovery of natural radioactivity.
1904
Rutherford discovers that alpha rays are heavy positively charged particles. In 1908 he is awarded a Nobel Prize in Chemistry for his work.
1905
Albert Einstein publishes the special theory of relativity regarding convertibility of matter and energy (E=mc2).
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