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: 1939 | PT id = 943, Type = formulation |
XBL 769-10601, Periodic Table Before World War II
An internal document of the Lawrence Berkeley Laboratory XBL 769-10601 shows a late 1930s (pre World War II) periodic table.
Note that this formulation erroneously predicts positions for transuranium 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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