Periodic Table |
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| What is the Periodic Table Showing? | Periodicity |
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. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).
| Year: 1942 | PT id = 521, Type = formulation |
Seaborg's Periodic Table of 1942
In 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, Glenn Seaborg describes how the extension of the PT, caused the discovery of the transuranic elements, plutonium and neptunium, resulted in a new "uranide" group.
The formulation below is the working (and at the time top-secret) formulation used by the Manhatten atomic bomb project. The Lawrence Berkeley Laboratory internal reference number for this document is XBL 798-2509.
Like the 1939 formulation, XBL 769-10601, the formulation below erroneously predicts positions for the heaviest elements:
- thorium is shown in the group below hafnium
- protactinium below tantalum
- uranium below tungsten
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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