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jan 1, 1869 - Dmitri Mendeleev: Periodic Table He organized the initial 63 elements into the periodic table by the atomic mass. The format of the rows and columns are still used today.
Added to timeline:
Atomic Structure timeline
By
Hillary Yip
25 Nov 2017
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749
Date:
jan 1, 1869
Now
~ 156 years ago
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