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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.

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Year:  1934 PT id = 290

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

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