Why Francis W. Aston received the 1922 Chemistry Nobel

Why it was awarded

Francis W. Aston received 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. The Nobel committee highlighted this contribution for its lasting importance to the field. This achievement represents one of the major advances recognized in chemistry at the time.