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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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Periodic Tables from the year 1921:

1921   Margary's Periodic Table
1921   Bury's Periodic Arrangement based on Langmuir's Theory
1921   Formánek's Periodic Table
1921   Margary's Modified Table

Year:  1921 PT id = 68

Margary's Periodic Table

From Quam & Quam's 1934 review paper.pdf

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Year:  1921 PT id = 1020

Bury's Periodic Arrangement based on Langmuir's Theory

Using Langmuir's theory of the arrangement of electrons in atoms, J.Am.Chem.Soc., 41, 868 (1919), Charles R. Bury formulated a Periodic Arrangement: C.R. Bury, Langmuir's theory of the arrangement of electrons in atoms and molecules, J. Am. Chem. Soc., 43, 1602-1609 (1921).

This formulation seems to be the basis of Seaborg's formulations of 1939, 1942 & 1945.

Ricardo R Contreras, Avances en Química, 14(1), 41-60 (2019), has re-drawn the Bury PT and writes [Google Translate]:

"This version emphasizes periods and electronic configurations.

"There is a long period in which the metals of titanium to copper are found, which he calls transition elements. [This formulation] leaves spaces for the element atomic number 43, technetium, discovered by Perrier Segre in 1937; for the element 72, hafnium, discovered in 1932 by D. Coster and G. von Hevesey; for the element 87, the eka-cesium, which corresponds to francium (Fr), discovered in 1939 by the French physicist Marguerite C. Perey (1909-1975) and, at the end of the group of halogens, for the element 85, the astatine (At), synthesized for the first time in 1940 by American physicists Dale R. Corson (1914-2012), Kenneth R. MacKenzie (1912-2002) and the Italian-American physicist Emilio G. Segrè (1905-1989) at the University of Berkeley (California), bombarding bismuth with particles.

"Bury uses 'A' as the symbol argon, 'Nt' (niton) for radon (Rn) and, the symbol 'Bv' (brevium) for proctactinium (Pa)."

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Year:  1921 PT id = 1192

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:

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.

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Year:  1921 PT id = 1237

Margary's Modified Table

Ivan D. Margary B.A. (1921) XXXVI. A modification more in accord with atomic structure, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 42:248, 287-288.

An old school table showing group 3 as B-Al-Sc-Yt-Rare earths.

Thanks to René for the tip!

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What is the Periodic Table Showing? Periodicity

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