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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: 

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Year:  2024 PT id = 1315, Type = formulation 3D spiral

Dufour’s Elementree in 2D by Vernon

A 2 dimension (flat) drawing of Dufour’s 3 dimensional Elementree by René Vernon.

René Vernon writes:

"I was surprised by its lack of symmetry in Dufour’s Elementree, caused by the awkward placement of He, and the assignment of H as floating above Li and Be. Hydrogen is as much subject to the periodic law as any other element. Without aligning H over Li, and He over Be, I am not sure that Elementree can be made symmetrical."

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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