The INTERNET Database of Periodic Tables
There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
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: 203–233
© Mark R. Leach 1999-
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