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jan 7, 1794 - Scientist Proust establishes the Law of Definite Proportions which says that a pure substance will always contain the same elements combined in the same proportion by mass.

Added to timeline:

24 Oct 2017
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A Timeline of the Atomic HIstory
Dalton's atomic theory was the first attempt to describe all...

Date:

jan 7, 1794
Now
~ 225 years ago

Images:

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