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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: 

  Text Search:       

Periodic Tables from the year 1990:

1990   Dufour's Periodic Tree
1990   Pawlowski's Circular Periodic Table
1990   Circular Model of the Atom: Opposition in the Elements

Year:  1990 PT id = 39

Dufour's Periodic Tree

The Dufour Periodictree periodic table formulation, from here:


Thanks to Eric Scerri for the tip!
See the website and Eric's Twitter Feed.

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Year:  1990 PT id = 436

Pawlowski Circular Periodic Table

On John Pratt's website there is an article that is both an introduction to Helen Pawlowski's model of the atom and to her Circular Periodic Table, as well as a book review of her book The Visualization of the Atom (Riverton, UT: Pawlowski Family Trust, 1990). First Helen and her work are introduced, then the model's strengths and weaknesses are summarized:

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Year:  1990 PT id = 716

Circular Model of the Atom: Opposition in the Elements

The Circular Model of the Atom is a circular periodic table that shows atomic structure in addition to periodicity. Unlike any other periodic table or model, it demonstrates that the atomic structure has an inherent dipole magnet that create positve and negative fields and elemental qualities at the atomic level.

The Circular Model of the Atom was created by Helen A. Pawlowski in the 1980s, and published in her work, Visualization of the Atom.

Her brother, Paul A. Williams extended many of Helen's ideas with his examination of the standard model using Helen's Circular Atom Model. This website contains some of Helen's ideas and Paul's writings.

Circular Model of the Atom: Opposition in the Elements

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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