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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 1300 Period Tables in the database: 

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Formánek's Periodic Table

Formánek J. 1921, Short Outline of Inorganic Chemistry (in Czech), 2nd ed., Ministerstvo zemedelstvi CSR, Praha. p. 281

René Vernon writes:

Here is an eight column table with some interesting features.

Main groups 0, Ia, IIa, Vb, VIb, and VIIb, correspond to what we have today:

• 0 Noble gases
• Ia Alkali metals
• IIa Alkaline earths
• Vb Pnictogens
• VIb Chalcogens
• VIIb Halogens

Main group IIIa is B-Al-Sc-Y... Ac whereas these days B-Al have been moved over Ga on electronic grounds. This happened despite the fact that the average trend line for chemical and physical properties v Z going down B-Al-Sc-Y... Ac is more regular.

In main group IV, notice how C and SI are positioned in the middle of the cell, unlike their neighbours to either side. The group thus bifurcates after Si into a Ti branch and a Ge branch. This is quite reasonable since there is not much difference in the average trendlines going down either option. In any case, C-Si came to be moved over Ge again on electronic grounds.

He survived the electronic revolution, staying over Ne.

© Mark R. Leach Ph.D. 1999 –

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