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Several people might claim this title but I would go for Ernest Rutherford.

In 1907 Rutherford took the chair of physics at the University of Manchester. There along with Hans Geiger and Ernest Marsden he carried out the Geiger-Marsden experiment, which demonstrated the nuclear nature of atoms. It was his interpretation of this experiment that led him to the Rutherford model of the atom, with a very small positively-charged nucleus orbited by electrons. In 1919 he became the first person to transmute one element into another when he converted nitrogen into oxygen through the nuclear reaction 14N(α,p)17O. In 1921, while working with Niels Bohr (who postulated that electrons moved in specific orbits), Rutherford theorized about the existence of neutrons, which could somehow compensate for the repelling effect of the positive charges of protons by causing an attractive nuclear force and thus keeping the nuclei from breaking apart. Rutherford's theory of neutrons was proved in 1932 by his associate James Chadwick, who in 1935 was awarded the Nobel Prize in Physics for this discovery.

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