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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 1100 Period Tables in the database:

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Periodic Table formulations from the year 1947:

1947   Stedman's Design
1947   Stedman's Conic System


Stedman's Design

In his article Stedman says:

Thanks to René for the tip!

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Stedman's Conic System

D. F. Stedman, A Periodic Arrangement of the Elements, Canadian Journal of Research, 1947, 25b(3): 199-210,

Stedman's conic system from van Spronsen:

From c&en:

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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