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dec 29, 1802 - John Dalton stated that elements were composed of atoms that had identical mass. He also proposed that another thing called compounds were atoms from different elements combined.

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:

dec 29, 1802
Now
~ 216 years ago

Images:

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