Francis William Aston FRS 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 many 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. The Nobel Prize in Chemistry 1922, announced November 9, 1922. Francis W. Aston, “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”. Francis W. Aston: born 1877, Harborne, United Kingdom. Wiki link Data: the Nobel Foundation (CC0).