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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:

1956   Remy's Periodic Table II: The Short Period Presentation
2021   The Periodic Table: Is it Perfect, is it Fractured or is it Broken?
2021   Hutcheon Right Step Periodic Table
2021   Quantum Periodic Table
2021   Rolled-up Version of Benfey's Periodic System
2016   Genoma de la Materia
2018   Elements in Six Dimensions
2021   Discoid Periodic Table of The Elements
2021   Mendeleyev-Sommerfeld IUPAC Periodic Table
2021   History [of the] Elements and Periodic Table


Remy's Periodic Table II: The Short Period Presentation

Next to Remy's Long Form Periodic Table (H. Remy, Treatise on Inorganic Chemistry, Vol. 1, Introduction and main groups of the periodic table, Elsevier, Amsterdam, 1956, p. 4) is what Remy calls a "Short Period presentation" shown in the appendix, pages 838-939. The author comments:

"The form of presentation used in Table II in which the elements of the Long Periods are divided into two series, so that the short Periods determine the horizontal breadth of the system, is known as the Short Period presentation, as contrasted with the Long Period presentation in which the elements of the Long Periods are each time included in a single series.

"The Short Periods can then be broken up accordingly. Mendeléeff had already used the short-periodic and long-periodic mode of tabulation. The adjacent Table I sets it out as a form which is based directly on that already used by Mendeléeff, but completed by the insertion of the elements discovered subsequently."

Click to enlarge:

Thanks to Mark Winter of WebElements for the tip!

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The Periodic Table: Is it Perfect, is it Fractured or is it Broken?

A video from Mark Leach, who writes:

The periodic table is an icon of science. Indeed, all chemical matter is made from periodic table stuff. The periodic table of 118 elements is often presented as being: (a) complete, (b) 'perfectly' described by the application of four quantum numbers with the application of some simple rules and (c) chemical structure & reactivity can be deduced from the periodicity of the Groups & Periods. However, the chemistry of the chemical elements is a little more involved than this. So, where & why does the predictability 'break'?

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Hutcheon Right Step Periodic Table

From Scott Hutcheon's Linkedin Website:


"Built from first principles, the RSPT is the only Periodic Table (so far) that reflects the periodicity of radioactive elements (natural and artificial) including Tc-Np and Cf/Es, the periodicity of liquids and gases (at standard and other conditions), depicts the 5 and 8 mass roadblocks, and finally clarifies the positions of the initial propagating elements H, He, and Li-Be/B in accordance with their cosmic and stellar evolutionary origins.

"Name inspired by the Janet Left Step Periodic Table (LSPT).

"Bonus Easter Egg: SPOCH BONSe, pronounced Spock Bones, is a new mnemonic device to remember the updated elements considered most essential for human life. Also considered POSCH SeNOB and SNOBS ePOCH."

Click PT image to enlarge:

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Quantum Periodic Table

Shriya Tiwari & D. K. Awasthi, Quantum Periodic Table, wjpmr, 2021, 7(4), 124-130

The authors write:

"In [the] quantum periodic table, The elements are arranged according to the order of electron-shell filling, by classifying the energy levels of the atoms in the order they are filled, to create a layout based on electronic configuration. The classification of the elements is done purely on the basis clarified above, without giving any weight age to the atomic numbers. With the advent of electronic configurations and quantum mechanics, many attempts have been tried in this periodic table to unlock all the problems related with the placement of elements, which have been remained as the topic of debate by generations of chemists."

Read more in the paper here.

Click PT image to enlarge:

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Rolled-up Version of Benfey's Periodic System

Rolled-up Version of Benfey's Periodic System by Julio Antonio Gutiérrez Samanez. More on the YouTube video here.

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Genoma de la Materia

By Julio Antonio Gutiérrez Samanez, Genome of Matter:

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Elements in Six Dimensions

The Elements in Six Dimensions, by Gerald Eadie, arranged by volume periods of nuclide mass averages:

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Discoid Periodic Table of The Elements

Statement: "The orbital periodicity of the elements are the periodic function of their atomic number." By Muzzammil Qureshi.

Muzzammil writes:

"Years before Mendeleev's publications, there was plenty of experimentation with alternative layouts for the elements. Even after the table got its permanent right-angle flip, folks suggested some weird and wonderful twists.

"One of them are Circular in shapes. Discoid means circular in shape, and there is a great reason for choosing such a shape. The term "Periodicity" itself means "To occur in intervals", and if you walk around in a circle, you will find that you will return to the point from where you started at. Similarly, if the elements are also arranged in such way, then we shall experience more periodicity in the elements than before..."

Read more here...

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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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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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