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may 24, 1869 - Dmitri Mendeleev

Description:

He put elements into 7 categories. "He discovered that the properties of elements 'were periodic functions of the their atomic weights'. This became known as the Periodic Law."

Added to timeline:

3 Oct 2017
0
0
151
Hazal and Verda atomic timeline

Date:

may 24, 1869
Now
~ 149 years ago
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