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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).
Periodic Tables from the year 1928:
| Year: 1928 | PT id = 74, Type = formulation spiral |
Janet's Helicoidal Classification
Janet's Helicoidal Classification, essentially his left-step formulation in its spiral version (ref. Charles Janet, La Classification Hélicoïdale des Éléments Chimiques. Beauvais: Imprimerie Départementale de l'Oise. 1928). Information supplied by Philip Stewart:
From Quam & Quam's 1934 review paper.pdf
| Year: 1928 | PT id = 152, Type = formulation |
Janet's Left Step Periodic Table
There are the three versions of Janet's left step PT. He tried out versions I and II in his April 1928 paper, and rejected them in favour of version III in his paper of November of the same year. Each one was derived from a helix drawn on nested cylinders. Information supplied by Philip Stewart. Click each image for a larger image:
| Year: 1928 | PT id = 289, Type = formulation spiral 3D |
Janet's Three-Dimensional Spiral-Tube System
Janet's Three-Dimensional Spiral-Tube System of 1928 (from van Spronsen):
Click here for large diagram.
| Year: 1928 | PT id = 305, Type = formulation spiral |
Janet's "Lemniscate" Formulation
From in The Helicoidal Classification of the Elements, Chemical News vol. 138, 21 June 1929, Fig. XI, p. 392:
Philip Stewart points out that this formulation is an 'end on' view of the Janet Cylinder or Three-Dimensional Spiral-Tube System formulation, and the term "lemniscate" comes from Mazurs.
| Year: 1928 | PT id = 594, Type = formulation |
Riesenfeld Periodic Table
From here, using Google Translate:
This table is from the book "Practical Inorganic Chemistry" Publisher EH Riesenfeld Labor, Barcelona (1950). It is a reprint of the second edition (1943) which in turn is a translation of a German edition, its seventh edition in 1928. This suggests that Riesenfeld is himself the author of it.
It is a pre-Seaborg table in the sense that the actinides are known throughout the period July. It also does not include the Tc since it was discovered in 1937. These facts support the dating of the table. But the most interesting thing about it is that to make the separation between subgroups and major groups Be cut after the first period and after the Al in the second. Which leaves isolated in group B without any element 2b below it:
Thanks to Eric Scerri for the tip!
See the website EricScerri.com and Eric's Twitter Feed.
| Year: 1928 | PT id = 989, Type = formulation |
Corbino's Right-Step Periodic Table
Published in the same year as Janet's Left-Step formulation, Corbino OM (1928) Riv Nuovo Cimento 5:LXI (and from here) produced a Right-Step version.
Commenting on this formulation, Valery Tsimmerman writes:
"Corbino saw what Janet failed to see: If blocks shifted by corresponding value of quantum number l, then the rows represent electronic shells and Janet saw what Corbino fained to see, namely the Janet rule, also known as Madelung rule. Both used rectangular boxes, but neither noticed the perimeter rule."
Thanks to Valery T for the tip!
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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