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sep 16, 1869 - Dmitri Mendeleev (1869) - put the elements into 7 groups with similar properties and discovered the Periodic Law

Added to timeline:

10 months ago
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Chem Project
Alyssa George, Riley Gloeckl, Grace Bair, Sonja Hebestreit

Date:

sep 16, 1869
Now
~ 149 years ago
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