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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.

Use the drop menus below to search & select from the more than 1100 Period Tables in the database:

  Text Search:       

Periodic Tables from the year 1984:

1984   Planiverse Periodic Table
1984   Discovery of Hassium
1984   Arabic Periodic Tables


Planiverse Periodic Table

The Planiverse is set in a 2-D universe that somehow enters into resonance with ours, enabling a computing professor (which Dewdney is) and his class to follow the adventures and scientific education of the hero Yendred (Dewdney backwards).

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Discovery of Hassium


Hassium, atomic number 108, has a mass of 270 au.

Synthetic radioactive element.

Hassium was first observed in 1984 by G. Münzenberg, P. Armbruster et al.

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Arabic Periodic Tables

From Arabic introductory text published by the Royal Scientific Society, Amman, Jordan, 1984. Jeries A. Rihani, who provided the two images, writes:

"The first image shows a periodic table similar to that of the Janet left-step periodic table, but in an upside-down flipped format.The second image displays the comparative energy levels of orbitals of atoms of many electrons."

Thanks to Jeries A. Rihani for the tip! 

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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