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.
Silberstein Periodic Table
The organization of the periodic table that follows is based on the principle that, as the
position of Lanthanum, Actinium, Lutetium, and Lawrencium is debated with regard to the
elements in Group III, all four of these elements can be placed in an “extended” Group III and
still have the correct arrangement on the periodic table. Although Scandium and Yttrium appear
to be separated from the rest of the transition metal elements, they in fact should be considered to
retain their original positioning as in a short-form table; that is, they are immediately to the right
of Calcium and Strontium and immediately to the left of Titanium and Zirconium. The curving of
the rare earth elements is merely a tool to denote the position of Lanthanum, Actinium, Lutetium,
and Lawrencium in Group 3, with the remainder of the rare earth elements placed outside of an
existing group, or rather creating their own group. View larger pdf file.
David Silberstein, August 2009
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