- Alternative periodic tables
Alternative periodic tables are
chemical elementdisplays different from the well known Mendeleev periodic table. Several have been devised often purely for didacticreasons as not all correlations between the chemical elements are effectively captured by the standard periodic table. A 1974 review of the tables then known [Mazurs, E. G. Graphical Representations of the Periodic System During One Hundred Years. Alabama; University of Alabama Press, 1974. ISBN 0-8173-3200-6.] is considered a definitive work on the topic.
Theodor Benfey's periodic table (1960) the elements spiral out in two dimensions starting from hydrogen folding their way around two islands, the transition metals & lanthanides and actinides. A superactinideisland is already slotted in. In the Chemical Galaxy(2004) the elements spiralout in a similar way.
Extended periodic table, suggested by Glenn T. Seaborgin 1969, yet unknown elements are included up to atomic number218. Heliumis placed in the group 2 elements. Timmothy Stowe created the physicist's periodic table. This table is three-dimensional and the three axes represent the principal quantum number, orbital quantum number, and orbital magnetic quantum number. Heliumis again a group 2 element.
Paul Giguere's 3-D periodic table consists of 4 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 billboard each making 90° angles contain the other elements.
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 aluminumAl7- cluster which behaves like a multivalent germaniumatom. ["Beyond The Periodic Table Metal clusters mimic chemical properties of atoms" Ivan Amato Chemical & Engineering NewsNovember 21, 2006 [http://pubs.acs.org/cen/news/84/i48/8448notw8.html Link] ]
In a commentary, R.L. Rich [Rich, Ronald L. J. Chem. Educ. 2005 82 1761] proposes 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 carbongroup based on similarities in chemical bonding to transition metals and a similar electronegativity. In this rendition of the periodic table carbonand siliconalso appear in the same group as titaniumand zirconium.
Alternative periodic tables are developed often to highlight or emphasize different chemical or physical properties of the elements which are not as apparent in traditional periodic tables. Some tables aim to emphasize both the nucleon and electronic structure of atoms. This can be done by changing the spatial relationship or representation each element has with respect to another element in the table. Other tables aim to emphasize the chemical element isolations by humans over time.
*E.R. Scerri. "The Periodic Table, Its Story and Its Significance." Oxford University Press, New York, 2007.
* [http://www.ipgp.jussieu.fr/%7Etarantola/Files/Professional/Mendeleev/ Periodic Table of the Elements (Janet form)]
*A [http://jeries.rihani.com/references.html Correction to Physicist periodic table offered by Jeries Rihani] as
Meitneriumoccupies the position that Hassiumshould have.
*A [http://www.wired.com/wired/archive/13.10/start.html?pg=11 Wired Article on Alternate Periodic Tables]
* [http://www.meta-synthesis.com/webbook/35_pt/pt.html A Selection of Periodic Tables]
* [http://www.webelements.com/nexus/?q=node/981 Janet periodic table]
* [http://www.ipgp.jussieu.fr/~tarantola/Files/Professional/Mendeleev/ Albert Tarantola's Periodic Table ]
*http://periodicspiral.com/ arranges the periodic table in a (hexagonal) spiral.
*" [http://www.rotaperiod.com Rotaperiod.com] " A new periodic table.
* [http://arxiv.org/abs/physics/0603026 Note] on the T-shirt topology of the Z-spiral.
* [http://www.egregoralfa.republika.pl/english/newtable.html New Periodic Table of the Elements] this is in a square-triangular periodic arrangement
* [http://www.egregoralfa.republika.pl/english/exttable.html Extended Periodic Table of the Elements] this is in a square-triangular periodic arrangement
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