
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.
2011 Weise's Tetrahedron
Dmitry Weise shows how it is possible to go from the Janet [leftstep] periodic table formulation, to a tetrahedral formulation.
Dmitry writes:
"Threedimensional table of the periodic law can be constructed in the form of a tetrahedron having an inner order. A comparison of the tetrahedron shells and the table of elements shows, that one tetrahedron shell corresponds to 4 periods of the 2D table."
Jess Tauber adds:
"The spheres here also aren't labeled, but I explain how they get labeled in the text accompanying the pic. Each such period (except for sonly, which are obviously simpler) we have a 'switchback' configuration. Like a road going up a mountain back and forth to minimize verticality, or a parachute folded into a pack. There are 8 different ways to do this (4 basic types in 2 chirally opposite mappings). And the original Weisestyle noncontinuous tetrahedron is just another way to organize half tetrahedra."
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Periodic Table, What is it showing? 
Binary Compounds

© Mark R. Leach 1999
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