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Francis William Aston, English chemical physicist, c 1920s.

Francis William Aston, (1877-1945) worked with J J Thomson (1856-1940) at Cambridge University. In 1919 he devised a mass spectrograph which was able to separate atoms of similar mass. With it he showed that not all atoms in a chemical element are identical. Aston identified the isotopes of over 50 elements. He was awarded the Nobel Prize for Chemistry in 1922.

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