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Dmitiri Ivanovich Mendeleyev (1834-1907), Russian chemist, c1900sDmitiri Ivanovich Mendeleyev (1834-1907), Russian chemist, c.1900s. Famous for arranging the 63 known elements into a Periodic Table based on Atomic Mass
Ernest Rutherford (1871-1937), Nobel prize-winning atomic physicist, c1908Ernest Rutherford (1871-1937), New Zealand atomic physicist, c1908. Awarded 1908 Nobel prize for chemistry. Is considered by many to have laid the groundwork for the development of modern nuclear
Enrico Fermi, Italian-born American nuclear physicist, c1942. Fermi (1901-1954) constructed the first working nuclear reactor, in a squash court at the University of Chicago in 1942