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.
Deming's (Updated) Periodic Table
This 1925 table has the Heavy Metals spread out, and the Rare Earth Elements (fifteen, including La and Lu) withdrawn into a box that is divorced from the body of the table. Ce, Gd, Yb form a vertical triad.
Th is assigned to Group IV below Hf.
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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