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August 1, 2025
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jan 1, 1862 - First Form of the Periodic Table

Description:

Published by Alexandre-Emile Béguyer de Chancourtois (1820-1886), the 'vis tellurique' consistuted as the earliest form of the modern periodic table.

It plotted atomic weight on a cylinder and revealed that similar periodic atomic weights appear in a similar formation. NOTE: He did not know of the chemical trends yet.

Added to timeline:

Date:

jan 1, 1862
Now
~ 163 years ago

Images: