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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:
A Timeline of the Atomic HIstory
By
Josie Ann
24 Oct 2017
1
0
761
Date:
jan 7, 1794
Now
~ 230 years ago
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