| Francis William Aston - Wikipedia, the free encyclopedia (284 words) |
 | Francis William Aston (born Birmingham, September 1, 1877; died Cambridge, November 20, 1945) was a British 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". |
| His work on isotopes also led to his formulation of the Whole Number Rule which states that "the mass of the oxygen isotope being defined, all the other isotopes have masses that are very nearly whole numbers," a rule that was used extensively in the development of nuclear energy. |
| The lunar crater Aston was named in his honour. |
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