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AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
98811
8760
2

nov 25, 1864 - Lothar Meyer

Description:

Categorized elements into 6 groups according to their "valence."

Added to timeline:

3 Oct 2017
0
0
151
Hazal and Verda atomic timeline

Date:

nov 25, 1864
Now
~ 154 years ago
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