Frederick Soddy

Frederick Soddy was a Nobel Prize winning English chemist and physicist. 
He graduated from Merton College, Oxford with a degree in chemistry. He won the Nobel Prize in Chemistry in 1921.
His work on the theory of how atoms worked was very important. He proved, amongst other things, the existence of isotopes and how radioactivity causes changes in atoms. Throughout his career he worked closely with another important atomic physicist, Ernest Rutherford.