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).
Periodic Tables from the year 1989 :
| 1989 | Stowe's A Physicist's Periodic Table |
| 1989 | Electron Shell Periodic Table |
| 1989 | Laing's Modification of The Periodic Table of the Chemical Elements |
| Year: 1989 | PT id = 38, Type = formulation 3D |
Stowe's A Physicist's Periodic Table
The Physicist's Periodic Table by Timothy Stowe is a well know formulation for those interested in such things, but for a long time its origin was been lost. Eric Scerri has rediscovered the original formulation: a 1989 publication by the company Instruments Research and Industry (I2R) Inc:


From Wikipedia, this Stowe Format Periodic Table is Based on a graphic from Scholten J."Secret Lanthanides", 2005, ISBN 90-74817-16-5;
Eric Scerri has developed an updated version of the Stowe formulation, here.
| Year: 1989 | PT id = 222, Type = formulation |
Electron Shell Periodic Table
A modified form of a periodic table showing known and predicted electron shells.
From G.T. Seaborg, Lawrence Berkeley National Laboratory, 1989. From the Encyclopedia Britanica website:

| Year: 1989 | PT id = 463, Type = formulation |
Laing's Modification of The Periodic Table of the Chemical Elements
Laing's modification of the periodic table. This arrangement has the lanthanide series (La to Lu) deliberately aligned with La below Y in Group 3 and with Ce below Zr in Group 4.
This places Pm below Tc, thus linking their common non-existence in Nature.

From Michael Laing's paper: A Revised Periodic Table with the Lanthanides Repositioned, Found. Chem. (2005) 7: 203–233
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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