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en
AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
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2

jan 17, 1869 - Mendeleev

Description:

Periodic Table of Element

Added to timeline:

11 months ago
0
0
89
electrons

Date:

jan 17, 1869
Now
~ 149 years ago
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