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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1964

Benfey's Spiral Periodic Table or Periodic Snail

Spiral Periodic Table by Otto Theodor Benfey:

From Wikipedia:

"One of the Benfey's publications in Chemistry was a model of an extended periodic table, sometimes referred to as the periodic snail. First published in 1964, it explicitly showed the location of lanthanides and actinides. The elements form a two-dimensional spiral, starting from hydrogen, and folding their way around two peninsulars, the transition metals, and lanthanides and actinides. A superactinide island is already slotted in." Read more here in an article by OTB: Bull. Hist. Chem., VOLUME 34, Number 2 (2009)

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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