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may 1, 1922 - Francis Aston

Description:

Aston (1877-1945) is the inventor of mass spectrometry. He discovered that the atomic mass of an element is not the mass of all the atoms of the element, but instead is a the weighted average mass of two or more isotopes of different masses.

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Chemistry: Atomic Models Timeline

ByRasmus Jacobs
26 Sep 2023
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Date:

may 1, 1922
Now
~ 104 years ago
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