Chemist and British physicist born in Eastbourne, and died in Brighton. He took a degree in chemistry from the University of Oxford. Two years later he worked as an Assistant lab at McGill University, in Montreal. Along with Rutherford, he explained the phenomenon of radioactivity. Disintegration theory proposed that the heavy atoms are unstable, an element can perhaps begin a spontaneous process of disintegration Atomic, surrendering a certain amount of mass and charge from their atoms to constitute a new element. They also forecast that the helium gas was the product of the disintegration of the radio. In 1913, Soddy made the clearest postulate of the law of radioactive displacement, which by then had just published. He coined the term isotope to refer to atoms with the same atomic number but different mass. In 1920 he saw the possibilities of the use of nuclear energy from uranium, application that came to see with their own eyes in 1945. In 1919 he obtained a professorship at Oxford. For his contributions to the knowledge of the chemistry of radioactive substances and for his research on the emergence and nature of isotopes received the prize Nobel Prize for Chemistry in 1921, awarded in 1922.