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jan 1, 1945 - Lanthanides and Actinides Identified

Description:

In 1945 Glenn Seaborg identified lanthanides and actinides (atomic number >92), which are usually placed below the periodic table.

Added to timeline:

Chemistry Honors Assignment

ByAYLOR LUSZCZEK

1 Oct 2018

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Date:

jan 1, 1945

Now

~ 80 years ago

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