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jan 4, 1945 - Glenn Seaborg identified lanthanides and actinides which are elements with atomic numbers higher than 92 and are placed in a separate section on the bottom in today's Periodic Table.

Added to timeline:

3 Oct 2017
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0
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History of the Periodic Table
Lily Heavner
Period 4

Date:

jan 4, 1945
Now
~ 73 years ago
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