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Whose discovery first showed that atomic mass can be measured in whole-number units with chlorine isotopes?
ChemistryIsotopes
Quick Answer
Francis Aston developed the mass spectrograph and discovered many isotopes in the 1910s and 1920s. His work helped explain why many elements have non-integer atomic masses.
The Full Story
Francis W. Aston built the mass spectrograph and used it to identify numerous isotopes, starting in the 1910s. His findings showed that atomic masses often reflect mixtures of isotopes rather than single whole-number values. This resolved a major puzzle in chemistry and improved the accuracy of atomic-weight tables. Aston’s work was so influential that he received the Nobel Prize in Chemistry in 1922.
Key Facts
1.mass spectrograph developed in the 1910s
2.Nobel Prize in Chemistry in 1922
3.explained non-integer atomic weights
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"The invention that showed elements come in different weights"