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AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
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2

nov 25, 1864 - Lothar Meyer

Description:

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

Added to timeline:

10 months ago
0
0
141
Hazal and Verda atomic timeline

Date:

nov 25, 1864
Now
~ 153 years ago
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