Alternative periodic tables
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Over a thousand have been devised, often for didactic reasons, as not all correlations between the chemical elements are effectively captured by the standard periodic table.
- 1 Major alternative structures
- 2 Variants of the classical layout
- 3 Extension of the periodic table
- 4 Gallery
- 5 References
- 6 Further reading
- 7 External links
Major alternative structures
Left-step periodic table (Janet, 1928)
Charles Janet's left-step periodic table  is the most widely used alternative to the traditional depiction of the periodic system. It organizes elements according to an idealized orbital filling (instead of valence).
Compared to the common layout, the left-step table has these changes:
- Helium is placed in group 2 (not in group 18).
- Groups 1 and 2 (the s-block), including elements 119 and 120 in extended period 8, are moved to the right side of the table.
- The s-block is shifted upwards one row, and all elements not in the s-block are now one row lower than in the standard table. For example, most of the fourth row in the standard table is the fifth row in this table.
In the result, the order is still consistently by atomic number (Z), 1–120.
Two-dimensional spiral (Benfey, 1964)
In Theodor Benfey's periodic table the elements form a two-dimensional spiral, starting from hydrogen, and folding their way around two peninsulas, the transition metals, and lanthanides and actinides. A superactinide island is already slotted in. The Chemical Galaxy (2004) is organized in a similar way.
Three-dimensional, flower-like (Paul Giguère, 1966)
Paul Giguère's 3-D periodic table consists of four connected billboards with the elements written on the front and the back. The first billboard has the group 1 elements on the front and the group 2 elements at the back, with hydrogen and helium omitted altogether. At a 90° angle the second billboard contains the groups 13 to 18 front and back. Two more billboards each making 90° angles contain the other elements.
Three-dimensional, physicist's (Timothy Stowe, 1986)
Timothy Stowe's physicist's periodic table is three-dimensional with the three axes representing the principal quantum number, orbital quantum number, and orbital magnetic quantum number. Helium is again a group 2 element.
Elements repeating (Ronald L. Rich, 2005)
Ronald L. Rich has proposed a periodic table where elements appear more than once when appropriate. He notes that hydrogen shares properties with group 1 elements based on valency, with group 17 elements because hydrogen is a non-metal but also with the carbon group based on similarities in chemical bonding to transition metals and a similar electronegativity. In this rendition of the periodic table carbon and silicon also appear in the same group as titanium and zirconium.
ADOMAH (Valery Tsimmerman, 2006)
The ADOMAH table  is an adaptation of the left step table. Each strictly vertical column of the table has the same value of the quantum number n. For example, n for Cd is 4. Each vertical column following the diagonals has the same value for the total of the quantum numbers n+l (each horizontal row of the left step table has the same such value). For example, the n+l value for Cd is 6. The quantum number values are those for the idealised differentiating electrons of each element, rather than the values for the experimentally determined differentiating electrons. Thus the quantum number value for the actual differentiating electron of Cd is 5, and the actual value for n+l is 5.
A chemists' table ("Newlands Revisited") with an alternative positioning of hydrogen, helium and the lanthanides was published by EG Marks and JA Marks in 2010.
Variants of the classical layout
From Mendeleev's original periodic table, elements have been basically arranged by valence (groups in columns) and the repetition therein (periods in rows). Over the years and with discoveries in atomic structure, this schema has been adjusted and expanded, but not changed as a principle.
The oldest periodic table is the short form table (columns I–VIII) by Dmitri Mendeleev, which shows secondary chemical kinships. For example, the alkali metals and the coinage metals (copper, silver, gold) are in the same column because both groups tend to have a valence of one. This format is still used by many, as shown by this contemporary Russian short form table, which includes all elements and element names until roentgenium.
H. G. Deming used the so-called long periodic table (18 columns) in his textbook "General Chemistry", which appeared in the USA for the first time in 1923 (Wiley), and was the first to designate the first two and the last five main groups with the notation "A", and the intervening transition groups with the notation "B".
The numeration was chosen so that the characteristic oxides of the B groups would correspond to those of the A groups. The iron, cobalt, and nickel groups were designated neither A nor B. The noble-gas group was originally attached (by Deming) to the left side of the periodic table. The group was later switched to the right side and usually labeled as group VIIIA.
Extension of the periodic table
In the research field of superatoms, clusters of atoms have properties of single atoms of another element. It is suggested to extend the periodic table with a second layer to be occupied with these cluster compounds. The latest addition to this multi-story table is the aluminium cluster ion Al−
7, which behaves like a multivalent germanium atom.
- E. R. Scerri. The Periodic Table, Its Story and Its Significance. Oxford University Press, New York, 2006, ISBN 0195345673.
- Henry Bent. New Ideas in Chemistry from Fresh Energy for the Periodic Law. AuthorHouse, 2006, ISBN 978-1-4259-4862-7.
- "Left Step Periodic Table". 1928. Retrieved 2014-02-15.
- Stewart, Philip J. (2009). "Charles Janet: Unrecognized genius of the periodic system". Foundations of Chemistry. 12: 5–15. doi:10.1007/s10698-008-9062-5.
- Benfey's table appears in an article by Glenn Seaborg, "Plutonium: The Ornery Element", Chemistry, June 1964, 37 (6), 12–17, on p. 14.
- Mazurs, E. G. (1974). Graphical Representations of the Periodic System During One Hundred Years. Alabama: University of Alabama Press. p. 111. ISBN 978-0-8173-3200-6.
- The animated depiction of Giguère's periodic table that is widely available on the internet (including here) is erroneous, as it does not include hydrogen and helium. Giguère included hydrogen, above lithium, and helium, above beryllium. See: Giguère P. A. (1966). "The 'new look' for the periodic system". Chemistry in Canada vol. 18 (12): 36–39 (see p. 37).
- Rich, Ronald L. (2005). "Are Some Elements More Equal Than Others?". J. Chem. Educ. 82 (12): 1761. Bibcode:2005JChEd..82.1761R. doi:10.1021/ed082p1761.
- Tsimmerman, Valery (2006). "ADOMAH Periodic Table". Retrieved 2014-02-16.
- Marks, E. G.; Marks, J. A. (2010). "Newlands revisited: A display of the periodicity of the chemical elements for chemists". Foundations of Chemistry. 12: 85–93. doi:10.1007/s10698-010-9083-8.
- Amato, Ivan (November 21, 2006). "Beyond The Periodic Table Metal clusters mimic chemical properties of atoms". Chemical & Engineering News.
- A 1974 review of the tables then known is considered a definitive work on the topic: Mazurs, E. G. Graphical Representations of the Periodic System During One Hundred Years. Alabama; University of Alabama Press, 1974, ISBN 0-8173-3200-6.
- Hjørland, Birger (2011). The periodic table and the philosophy of classification. Knowledge Organization, 38(1), 9–21.
- Representing the Periodic Table in Different Ways a site curated by the Michigan State University Alumni Association Knowledge Network
- Robert Harrison's modern spiral periodic table
- Janet's Left Step Periodic Table
- Correction to Physicist periodic table offered by Jeries Rihani as Meitnerium occupies the position that Hassium should have.
- A Wired Article on Alternate Periodic Tables
- A Selection of Periodic Tables
- http://periodicspiral.com/ arranges the periodic table in a (hexagonal) spiral.
- Rotaperiod.com A new periodic table.
- Note on the T-shirt topology of the Z-spiral.
- New Periodic Table of the Elements this is in a square-triangular periodic arrangement.
- Periodic Table based on electron configurations
- Database of Periodic Tables
- Periodic Fractal of the Elements
- Bob Doyle Periodic Table of the Elements A regrouping by properties used to better explain electron grouping
- Earth Scientist's Periodic Table