Alternative periodic tables are chemical element displays different from the well known Mendeleev periodic table. Several have been devised often purely for didactic reasons as not all correlations between the chemical elements are effectively captured by the standard periodic table. The definitive work is Mazurs ^[1]. The periodic table of the chemical elements A chemical element, often called simply an element, is a substance that cannot be decomposed or transformed into other chemical substances by ordinary chemical processes. ... The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements first created in 1869 by Russian chemist Dmitri Mendeleev. ... This is a standard display of the periodic table of elements. ...

In Thoedor 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 superactinide island is already slotted in. In the Chemical Galaxy (2004) the elements spiral out in a similar way. In chemistry, the term transition metal (sometimes also called a transition element) has two possible meanings: It commonly refers to any element in the d-block of the periodic table, including zinc, cadmium and mercury. ... The lanthanide series comprises the 15 elements from lanthanum to lutetium on the periodic table, with atomic numbers 57 through 71. ... The actinide series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table with atomic numbers 89 - 103. ... Superactinides are the undiscovered chemical elements from number 123 (Unbitrium) until 153 (Unpenttrium), at which the 5g and 6f- electron shells are filled up. ... The Chemical Galaxy is a new periodic table designed by Philip Stewart in November 2004 based on the cyclical nature of characteristics of the chemical elements (which depend principally on the valence electrons). ... In mathematics, a spiral is a curve which turns around some central point or axis, getting progressively closer to or farther from it, depending on which way you follow the curve. ...

In the Extended periodic table, suggested by Glenn T. Seaborg in 1969, yet unknown elements are included up to atomic number 218. Helium is placed in the group 2 elements This extended periodic table was suggested by Glenn T. Seaborg in 1969. ... Glenn T. Seaborg Glenn Theodore Seaborg (April 19, 1912 – February 25, 1999) was an American chemist prominent in the discovery and isolation of ten transuranic elements including plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium and seaborgium, which was named in his honor. ... In chemistry and physics, the atomic number (Z) is the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life). ...

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. Helium is again a group 2 element. In atomic physics, the principal quantum number symbolized as n is the first quantum number of an atomic orbital. ... The Azimuthal quantum number (or orbital angular momentum quantum number) symbolized as l is a quantum number for an atomic orbital which determines its orbital angular momentum. ... By virtue of its charge and spin motion, an electron develops a magnetic field. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life). ...

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. The alkali metals are a chemical series. ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life). ...

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-storey table is the aluminum Al₇^- cluster which behaves like a multivalent germanium atom ^[2] Superatoms are clusters of atoms which seem to exhibit some of the properties of elemental atoms. ... In chemistry, a cluster is an array of bound atoms that is intermediate in character between a molecule and a solid. ... Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ... General Name, Symbol, Number germanium, Ge, 32 Chemical series metalloids Group, Period, Block 14, 4, p Appearance grayish white Atomic mass 72. ...

In a commentary R.L. Rich ^[3] 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 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. The alkali metals are a chemical series. ... Valence, also known as valency or valency number, is a measure of the number of chemical bonds formed by the atoms of a given element. ... The halogens are a chemical series. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Electronegativity is a measure of the ability of an atom or molecule to attract electrons in the context of a chemical bond. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance as coarse powder, dark gray with bluish tinge Atomic mass 28. ... General Name, Symbol, Number titanium, Ti, 22 Chemical series transition metals Group, Period, Block 4, 4, d Appearance silvery metallic Atomic mass 47. ... General Name, Symbol, Number zirconium, Zr, 40 Chemical series transition metals Group, Period, Block 4, 5, d Appearance silvery white Atomic mass 91. ...

Circular form of periodic table

Circular form of the periodic table.

The major disadvantage of the standard periodic table is its shape itself. Rectangular arrangement of elements puts constraints in describing the properties of the elements such as shape, atomic structure, nucleus, etc. With the developments in the nucleon shell model it is far more informative to have a complete periodic table showing both nucleon as well as electronic structure. Image File history File links Circular_form_of_periodic_table. ... Image File history File links Circular_form_of_periodic_table. ...

To incorporate more and more amount of properties in a form of arrangement of elements a new circular of periodic table is put forward by Mohd Abubakr (Hyderabad, India). The aim of this circular form of table is make a student understand the atomic structure and its properties along side the periodic table. This table does include all the properties of the Modern Periodic table meanwhile adding further advantages. For other uses, see Hyderabad. ...

Salient features of Circular Form of Periodic Table:

1. It clearly reflects the atomic structure of an element along with the electronic configuration.
2. It shows pictorially the arrangement of electrons outside the nucleus.
3. The atomic nucleus is also shown in the circular form, which is absent in any modern form of the periodic table.
4. This periodic table is based on Bohr’s model of atomic structure.
5. Once the nucleon shell model gets fully developed, in can be incorporated in the table easily.
6. Properties like atomic radius, ionization energy, electron affinity, electro negativity metallic character, binding energies and diagonal relationships can be explained in a far more convenient way using this form.
7. The layout forms the separate energy levels, each shown in a separate colour.
8. The circular periodic table consists of 18 sectors called as groups similar to Modern periodic table.
9. Considering the size and shape of hydrogen and helium atoms they are shown much closer to the nucleus.

The Bohr model of the hydrogen atom. ...

References

Chemistry & Engineering News is a weekly chemistry trade magazine published by the American Chemical Society. ...

External links

• The Thoedor Benfrey periodic table
• Periodic Table of the Elements (Janet form)
• A Correction to Physicist periodic table offered by Jeries Rihani as Meitnerium occupies the position that Hassium should have.
• The Paul Giguere 3-D periodic table requires Quicktime
• A Wired Article on Alternate Periodic Tables
• A Selection of Periodic Tables
• Janet periodic table
• Albert Tarantola's Periodic Table (1975)
• http://periodicspiral.com/ arranges the periodic table in a (hexagonal) spiral.