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: Dr Mark R Leach.
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The 10 Periodic Tables most recently added to the database:
"To celebrate the International Year of the Periodic Table of Chemical Elements, our editors have curated research papers, commentaries and multimedia from Nature and the Nature Research journals.
Dive in to find out what connects sodium with Sri Lanka, how many times astatine was discovered and where the White House got its name... And much more!"
Scerri's The Periodic Table: Its Story & Its Significance 2nd Edition
The 2nd Edition of Eric Scerri's well redarded book, The Periodic Table: Its Story & Its Significance has been published by Oxford University Press and is available at all good bookshops, including online.
A Novel Way of Visualization of the Periodic Table of the Elements by Alaa El-Deen Ali Mohamed, Alexandria University, Egypt.
The author writes:
"New form of the periodic table of the elements is given in this paper. This form can be seen as two amphitheater pyramids facing each other. The cubes that meet are s-elements (interior) then the p-elements then d-elements and the f-elements at last (exterior). The table can be represented by X-, Y- and Z-axes, where the Z-axis gives the number of the period that the element occupies. The table can be modeled by colored cubes helping in introducing the periodic table to the pupils early in the primary education."
Kipp (& Mazurs') Periodic Table in Style of Spiral and Plane Lemniscate
Kipp, Friedrich, and Edward G. Mazurs. "Periodic Table in Style of Spiral and Plane Lemniscate". Glass, circa 1942–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute, Philadelphia. https://digital.sciencehistory.org/works/nz806022g
Periodic table in style of spiral and plane lemniscate 1942 (Original design) circa 1957 (Date attributed to slide).
From N.V. Sidgwick, Chemical Elements and Their Compounds, vol. 1, Oxford University, London, p. xxviii (1950).
René Vernon writes:
"In this curious table the Lanthanides are located in group IIIA while the Actinides have been fragmented.
• Ac, Th, and Pa are located in groups IIIA, IVA and VA under Lu, Hf, and Ta, respectively
• The uranides, U, Np, Pu, Am, and Cm, are located in group VIA, under W."
"This subgroup (VIA) consists of Cr, Mo, W, and U, to which the 'uranide' elements, Np, Pu, Am, and Cm (which might be assigned to any Group from III to VI) must now be added." (p. 998)
"...the trans-uranium elements 93–6... for the first time give clear evidence of the opening of the 'second rare earth series', the 'uranides', through the expansion of the fifth quantum group from 18 towards 32." (p. 1069)
"The question whether the fifth quantum group of electrons which is completed up to 18 in gold begins to expand towards 32, as the fourth does in cerium, has now been settled by the chemical properties of these newly discovered elements. In the Ln the beginning of the expansion is marked by the main valency becoming and remaining 3. With these later elements of the seventh period there is scarcely any sign of valencies other than those of the group until we come to uranium... Up to and including uranium, the group valency is always the stablest, but beyond this no further rise of valency occurs, such as we find in rhenium and osmium. Hence the point of departure of the new series of structures (corresponding to lanthanum in the first series) is obviously uranium, and the series should be called the uranides. (p. 1092):
Updated from this 2002 entry comes: Quebec System, Numbers and geometry in the classification of the elements by Pierre Demers.
"First, I present the Periodic Table of Elements, and I proceed to improve it. By an arithmetic and geometrical analysis, I make appear important symmetries of order four which exist in the arrangement of the atoms between them. I confirm these results with an original discussion of irregular atoms. I will try, in a work that will follow, to interpret the symmetries of the classification by the symmetries of the atom which are associated with the precession cones of the kinetic moments and orbitals."