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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:       

The 10 Periodic Tables most recently added to the database:

2021   Mendeleyev-Sommerfeld IUPAC Periodic Table
2021   History [of the] Elements and Periodic Table
1956   Sistema Periodico de Los Elementos (after Antropoff)
2021   Largest Periodic Table in Eurasia Created in Dubna
1916   Sommerfeld's Periodic Table
2021   Mendeleyev Revisited
2021   Term & Spin State Periodic Table
1932   Bejerrum's Periodic Table
2021   Vernon's Eight-Fold Way Periodic Table
2006   Nandor's Exhaustive Lists of Chemical Words


Mendeleyev-Sommerfeld IUPAC Periodic Table

From John Marks' updated Mendeleyev-Sommerfeld IUPAC Periodic Table.

John writes:

This is an adaptation of Fig. 4 [from] to match IUPAC's 18-column table. The yellow (transition metals) are Sommerfeld's 'A'-subgroups and the green (rare earths) are Sommerfeld's 'B'-subgroups.

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History [of the] Elements and Periodic Table

From the Royal Society of Chemistry (RSC) an interactive Elements and Perioid Table History web page:

Thanks to Eric Scerri for the tip!

See the website and Eric's Twitter Feed.

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Sistema Periodico de Los Elementos (after Antropoff)

Mario Rodríguez Peña, PhD translates the spanish text on the website:

"Periodic System of Elements, type Antropoff., 1956 Antropoff's periodic table was designed in Bonn (Germany) in 1926: It was disused after the WWII (1945) in most of the countries, except Spain. This was dated in 1956 because Mendelevium (101) was discovered and accepted by IUPAC in 1955 and in 1957, the element symbols of Argon (18), Xenon (54), Einstenium (99) and Mendelevium itself changed to the current Ar, Xe, Es and Md, respectively."

Click the image to enlarge.

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Largest Periodic Table in Eurasia Created in Dubna

From The Times of India:

"The largest [PT] in Eurasia, the Periodic Table of Mendeleev opened in Dubna near Moscow. The event is timed to coincide with the 65th anniversary of the Joint Institute for Nuclear Research located here and the city itself. It is noteworthy that it is at JINR, in the Laboratory of Nuclear Reactions. G N Flyorov under the guidance of Academician of the Russian Academy of Sciences Yuri Oganesyan, all known to date superheavy elements were obtained – from 113th to 118th (the latter is even named after the scientist – 'Oganeson Og'). Oganesyan is the second scientist in the world, after whom a new element of the Periodic Table was named during his lifetime (the first was the American scientist Glenn Theodore Seaborg)."

Thanks to Eric Scerri for the tip!

See the website and Eric's Twitter Feed.

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Sommerfeld's Periodic Table

A periodic table by Arnold Sommerfeld, as an updated construction by Marks & Marks (2021).

John Marks writes:

"The reconstruction of Sommerfeld 1916 is derived from my reading of Henry Browse's translation of the third German edition of his Atomstruktur und Spektrallinien (Methuen 1923). Sommerfeld found the explanation of the greater (d– and f–) and lesser (s– and p–) periods in the solution of Kepler's ellipses using Schwarzschild's relativistic correction, communicated to him from the battlefront of WW1. Sommerfeld considered helium "an exception" but this is only an appearance deriving from defining periods as terminated by inert gases. In fact, the first period begins with hydrogen so the markers of periods are analogues of hydrogen, viz. the halogens."

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Mendeleyev Revisited

An Open Access paper: Marks, E.G., Marks, J.A. Mendeleyev revisited. Found Chem 23, 215-223 (2021).

"Despite the periodic table having been discovered by chemists half a century before the discovery of electronic structure, modern designs are invariably based on physicists' definition of periods. This table is a chemists' table, reverting to the phenomenal periods that led to the table's discovery. In doing so, the position of hydrogen is clarified."

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Term & Spin State Periodic Table

A Tern & Spin State periodic table by Gnanamani Simiyon who writes:

"We tried to arrange the elements based on the ground state term and spin state. I attached picture of the periodic table drawn. For example, I notice that alkali metals and coinage metals grouped up indicating some relationship between the groups. Similarly with respect to alkaline Earth metals and Zinc group. We are unable to further understand other groupings based on the ground state term and spin state."

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Bejerrum's Periodic Table

Bjerrum N, Inorganic chemistry, trans. (1936) from the 3rd Danish edition (1932) by N Bjerrum and RP Bell, William Heinemann, London

René Vernon observes:

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Vernon's Eight-Fold Way Periodic Table

René Vernon suggests that the chemical elements can be grouped into eight classes: four metallic (Active, Transition, Post-Transition and Noble) and four non-metallic (Halogen, Biogen, Metalloid and Noble gas):

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Nandor's Exhaustive Lists of Chemical Words

From a really interesting PT website, Mark Nandor's Exhaustive Chemical Words:

So what, exactly, is a "chemical word"? It is an English word that can be spelt using element symbols as 'letters', [famously] for example: Beer (or BeEr):

Arches can be "spelt" in two ways:

ArCHeS   [Argon, Carbon, Helium, Sulfur]
ArCHEs   [Argon, Carbon, Hydrogen, Einsteinium]

On the other hand, there is no way at all to "spell" a work like pillar.

Mark Nandor provides several exhaustive lists:

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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