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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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1898

Crookes' vis generatrix

Model of Crookes’ vis generatrix of 1898, built by his assistant, Gardiner. From: Proc. R. Soc. Lond. 63, 408.

The vertical scale represents the atomic weight of the elements from H = 1 to Ur = 239.

Missing elements are represented by a white circle. Similar elements appear underneath each other:

Cutting Board

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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