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jan 7, 1940 - Current Periodic Table

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The last major change to the periodic table was made by Glenn Seaborg in 1951. In 1941, he discovered plutonium and then continued to discover all the transuranic elements from 94 to 102. He reconfigured the periodic table by placing the actinoid series below the lanthanoid series at the bottom of the table.

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History of the Periodic Table - 10

ByTyler
15 Oct 2018
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Date:

jan 7, 1940
Now
~ 85 years ago
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