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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:  2021 PT id = 1218, Type = formulation

Mendeleyev-Sommerfeld IUPAC Periodic Table

From John Marks' updated Mendeleyev-Sommerfeld IUPAC Periodic Table.

John writes:

This is an adaptation of Fig. 4 [from https://link.springer.com/article/10.1007/s10698-021-09398-4] to match IUPAC's 18-column table. The yellow (transition metals) are Sommerfeld's 'A'-subgroups and the green (rare earths) are Sommerfeld's 'B'-subgroups.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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