Francis William Aston
External video Michael A. Grayson, Discovery of Isotopes of Elements (Part II: Francis William Aston), Profiles in Chemistry, Chemical Heritage Foundation Francis William Aston FRS (1 September 1877 – 20 November 1945) was a British chemist and physicist who won the 1922 Nobel Prize in Chemistry for his discovery, by means of his mass spectrograph, of isotopes, in a large number of non-radioactive elements, and for his enunciation of the whole number rule. He was a fellow of the Royal Society and Fellow of Trinity College, Cambridge.