Aston, Francis William (1877–1945)

Francis William Aston

Francis Aston was a British physicist who was awarded the 1922 Nobel Prize in Chemistry for his work on isotopes. Aston developed the mass spectrograph (see mass spectrometry) that separates isotopes, and he used it to identify 212 naturally occurring isotopes. His work led to the formulation of the whole-number rule for isotopic weights.