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What is the Periodic Table Showing? Periodicity

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. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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Periodic Tables referencing the text string "Romanoff", listed by date:

1934   Romanoff's System


Year:  1934 PT id = 290, Type = formulation spiral 3D

Romanoff's System

From Revue Scientifique 1934, V. Romanoff's paper (pages 661–665) Le Système Périodique de Mendéléeff Par Représentation Graphique.

Dr. Erik Strub writes:

"The article's Fig. 1 is the first [formulation] (to my knowledge) which contains a "classical" representation of the periodic system in which an Actinoide series is placed beneath the Lanthanoides and not beneath the d block elements:



Romanoff's System of 1934 (from van Spronsen):

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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