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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 1913:

1913   Moseley's Periodic Law
1913   Rydberg's Table
1913   Discovery of Protactinium
1913   Rydberg's Periodic Table in style of Spiral with Four Revolutions
1913   van den Broek's Periodic Table 3

Year:  1913 PT id = 13

Moseley's Periodic Law

Henry Moseley (1887-1915) subjected known elements to x-rays and was able to derive a relationship between x-ray frequency and number of protons.

From Scientific American:

"It was the clever young English physicist, Moseley, who discovered that the atomic number for each element was the number of external electrons in the atom.

"With this discovery came a law concerning the X-ray lines of any element in an X-ray target.

"Moseley's law states that the wavelength of these lines is inversely proportional to the square of the atomic number of the element. Therefore, if we know the atomic number of the element we are looking for, we can predict the wavelength of certain lines in its X-ray spectrum.

"If we set up our X-ray spectrograph so as to catch these lines where we expect them to fall, then, if the element is present in the target which we have chosen to use in our X-ray tube, we should know it. This provides one good way to identify difficult elements, but it is well to have another to use as a check. One of the best of these, and one which is almost as sensitive as the X-ray method, is that of positive ray analysis."

From his paper, The High Frequency Spectra of The Elements, H. G. J. Moseley, M. A. Phil. Mag. (1913), p. 1024, available here:

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Year:  1913 PT id = 59

Rydberg's Table

From Quam & Quam's 1934 review paper.pdf

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Year:  1913 PT id = 871

Discovery of Protactinium


Protactinium, atomic number 91, has a mass of 231.036 au.

Radioactive element: Pa is only found in tiny amounts in nature. Most samples are synthetic.

Protactinium was first observed or predicted in 1913 by O. H. Göhring and K. Fajans and first isolated in 1927 by A. von Grosse.

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Year:  1913 PT id = 973

Rydberg's Periodic Table in style of Spiral with Four Revolutions

Periodic table in style of spiral with four revolutions circa 1913 (Original design) and 1957 (Date attributed to slide).

This table was originated by Swedish physicist Johannes Rydberg (1854-1919) in 1913 and classified by chemist Edward G. Mazurs as Type IIIB2-1 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). The lower version of the table appears as Figure 63 on page 132 of Mazurs' 1957 publication.

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Year:  1913 PT id = 1000

van den Broek's Periodic Table 3

From Wikipedia: Antonius Johannes van den Broek (1870-1926) was a Dutch amateur physicist notable for being the first who realized that the number of an element in the periodic table (now called atomic number) corresponds to the charge of its atomic nucleus. The 1911 inspired the experimental work of Henry Moseley, who found good experimental evidence for it by 1913. van den Broek envisaged the basic building block to be the 'alphon', which weighed twice as much as a hydrogen atom.

Read more in Chapter 4, Antonius Van Den Broek, Moseley and the Concept of Atomic Number by Eric Scerri. This chapter can be found in the book: For Science, King & Country: The Life and Legacy of Henry Moseley (Edited by Roy MacLeod, Russell G Egdell and Elizabeth Bruton).

van den Broek's periodic table of 1907: Annalen der Physik, 4 (23), (1907), 199-203

van den Broek's periodic table of 1911: Physikalische Zeitschrift, 12 (1911), 490-497); and also a paper in Nature the same year entitled: The Number of Possible Elements and Mendeléff's "Cubic" Periodic System, Nature volume 87, page 78 (20 July 1911)

van den Broek's periodic table of 1913: Physikalische Zeitschrift, 14, (1913), 32-41

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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