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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1300 Period Tables in the database: 

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Year:  1945 PT id = 522

Seaborg's Periodic Table of 1945

From his Priestly Medal Address, The Periodic Table: Tortuous Path to Man-Made Elements printed in C&EN April 16, 1979 and reprinted in Modern Alchemy: Selected Papers of Glenn T. Seaborg (1994), page 181.

Seaborg describes how "the theory was advanced that [the] new elements heavier than than actinium might constitute a second series similar to the series of 'rare-earth' or 'lanthanide' elements":

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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