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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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1989

Laing's Modification of The Periodic Table of the Chemical Elements

Laing's modification of the periodic table. This arrangement has the lanthanide series (La to Lu) deliberately aligned with La below Y in Group 3 and with Ce below Zr in Group 4.

This places Pm below Tc, thus linking their common non-existence in Nature.

From Michael Laing's paper: A Revised Periodic Table with the Lanthanides Repositioned, Found. Chem. (2005) 7: 203233

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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