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  Web Book Home Page | Chemogenesis Main Index Foreword:  Chemogenesis & Chemical Education Part I   Atoms | Elements | Periodic Tables 1.1  Introduction to Chemogenesis 1.2  Nucleosynthesis of The Elements 1.3  The Segrè Chart 1.4  Quantum Numbers to Periodic Tables 1.5  The Periodic Table: What Is It Showing? 1.6  The INTERNET Database of Periodic Tables 1.7  Periodicity Part II   Structure | Bonding | Material Type 2.1  Mono-Bond Typed Binary Compounds 2.2  Binary Compound Synthlet 2.3  Electronegativity 2.4  van Arkel-Ketelaar Triangles of Bonding 2.5  Tetrahedra of Structure, Bonding & Material Type 2.6  Structure, Bonding & Material Synthlet 2.7  The Classification of Matter: Chemical Stuff Part III   Interactions | Reactions | Mechanisms 3.1  The Chemogenesis Analysis: An Overview 3.2  Lewis and Brønsted Models of Acidity 3.3  The Hard Soft [Lewis] Acid Base Principle 3.4  Main Group Elemental Hydrides 3.5  Five Hydrogen Probe Experiments 3.6  Congeneric Dots, Series & Planars 3.7  Quantifying Congeneric Behaviour 3.8  Ligand Replacement Congeneric Series 3.9  Congeneric Array Interactions 3.10  Emergence of Organic Chemistry 3.11  Congeneric Array Database 3.12  The Five Reaction Chemistries 3.13  Lewis Acids & Lewis Bases: A New Analysis 3.14  The Lewis Acid/Base Interaction Matrix 3.15  Patterns in Reaction Chemistry Poster 3.16  Lewis Acid/Base Interaction Matrix Database 3.17  Nucleophiles, Bases & The Fluoride Ion 3.18  Redox Chemistry 3.19  Redox Chemistry Synthlet 3.20  Radical Chemistry 3.21  Diradical Chemistry 3.22  Photochemistry 3.23  Species/Species Interactions 3.24  The Simplest Mechanistic Step: STAD 3.25  Unit & Compound Mechanistic Steps 3.26  The Mechanism Matrix 3.27  Addition To A Double Bond Synthlet 3.28  Pericyclic Reaction Chemistry Part IV   Chemical Theory 4.1  Why Do Chemical Reactions Occur? 4.2a  Thermochemistry: List Reactions Synthlet 4.2b  Thermochemistry: Play With Reaction Synthlet 4.2c  Thermochemistry: Bulid A Reaction Synthlet 4.3  Timeline of Structural Theory 4.4  Modern Lewis Theory 4.5  Valence Shell Electron Pair Repulsion: VSEPR 4.6  Diatomic Species by Molecular Orbital Theory 4.7  Polyatomic Species: Molecular Orbitals 4.8  Organic π-Systems 4.9  Functional Group Database Part V   Complexity & Emergence 5.1  Chemistry & Complexity: Systems 5.2  Linear Chemistry Systems 5.3  Chemical Systems Prone to Complexity Part VI   Extras 6.1  Chemogenesis Videos 6.2  Chemical Thesaurus Reaction Chemistry Database 6.3  Paper: Chemogenesis 6.4  Paper: Electronegativity as a Basic Elemental Property (FoC) 6.5  Workshop: What is Chemistry? 6.6  Paper: Scientific laws, Dalton’s postulates, chemical reactions
          and Wolfram’s NKS (FoC) 6.7  Literature References & Further Reading

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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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• By Decade
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  Best Four Periodic Tables for Data All Periodic Tables by Name All Periodic Tables by Date All Periodic Tables by Reverse Date All Periodic Tables, as Added to the Database All Periodic Tables, reverse as Added Elements by Name Elements by Date Discovered Search for: Mendeleev/Mendeléeff Search for: Janet/Left-Step Search for: Eric Scerri Search for: Mark Leach Search for: René Vernon Search for: Electronegativity
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The 10 Periodic Tables most recently added to the database:

LEGO Periodic Tower of The Elements

A LEGO Periodic Tower of The Elements, a form of Schaltenbrand's 1920 Helical Periodic Table, by Enrique Barrajón, as shown on the LEGO Ideas website.

Enrique writes:

"The Periodic Tower of Elements is a complex LEGO project designed for students with some chemistry knowledge. It serves as an educational tool to help with learning basic chemistry and physics concepts. Building this model enhances skills such as patience, balance, attention to detail, and innovation—qualities essential for mastering abstract scientific ideas. Additionally, the model offers insights into architectural stability concepts like spiral staircases."

Phonics, Periodic Table of

A Periodic Table of Phonics from dyslexiclogic.com.

"The Periodic Table of Phonics allows us to see the relationship between the different sounds in the English language, but also how they relate to the most common spelling patterns. Children with dyslexia often have poor phonological awareness, meaning that they may struggle to perceive the difference between sounds that sound similar (eg. /th/ and /v/) or are articulated in a similar way (eg. /d/ and /t/)."

Thanks to René Vernon for the tip!

A Chemistry Teacher's Perspective of the Periodic System

A Chemistry Teacher's Perspective of the Periodic System, from Science History Institute, Museum & Library Digital Collections.

René Vernon writes:

"It looks like, going by groups, the alkali and alkaline metals & the halogen nonmetals get the most attention. Among the rest of the nonmetals, CHONPS get a good profile with poor Se left in a hole. That leaves B-Si-Ge (in a hole)-As-Sb-Te and the noble gases."

pgf-PeriodicTable: Create Custom Periodic Tables

A website that enables the construction of publication quality periodic tables.

Read the package documentation.

A pre-print of a paper Periodic table for highly charged ions by Lyu, Keitel & Harman says:

Abstract: Mendeleev’s periodic table successfully groups atomic elements according to their chemical and spectroscopic properties. However, it becomes less sufficient in describing the electronic properties of highly charged ions (HCIs) in which many of the outermost electrons are ionized. In this work, we put forward a periodic table particularly suitable for HCIs. It is constructed purely based on the successive electron occupation of relativistic orbitals. While providing a much-simplified description of the level structure of highly charged isoelectronic ions – essential for laboratory and astrophysical plasma spectroscopies, such a periodic table predicts a large family of highly forbidden transitions suitable for the development of next-generation optical atomic clocks. Furthermore, we also identify universal linear Z scaling laws (Z is the nuclear charge) in the so-called "Coulomb splittings" between angular momentum multiplets along isoelectronic sequences, complementing the physics of electron-electron interactions in multielectron atomic systems.

Purriodic Table of The Kittens

https://www.qwertee.com/shop/tees/purriodic-table-of-the-kittens

Yorkshire, Periodic Table of

If thas from Yorkshire tha better speak proper! Our Yorkshire Periodic Table Print lays out all the essential Yorkshire words and phrases you need to speak to the locals. We love the unique dialects and accents across Yorkshire and this print is a celebration of our Yorkshire tongue.

From The Yorkshire Print Company

Click to enlarge:

Kapustinsky's Structure of The System of Elements

René Vernon writes:

Kapustinsky AF 1951, Structure of the periodic table of chemical elements (in Russian), Proceedings of the USSR Academy of Sciences, vol. 81, no. 1, pp. 47–50

Below the title Kapustinsky gives two equations that he says determine the structure of the system:

• The equation of periods Š = 4 x n²;
• The equation of cycles/dyads S = 2(n²₁ + n²₂).

The legend at the bottom left is:

• Period
• Cycle
• Number of elements

Kapustinsky refers to the periodic system of elements in terms of its emergence (proto-elements), formation (typical elements), and disintegration (synthetic elements). Kapustinsky refers to e, n, H, He as "proto-elements".

The electron and the neutron are not chemical elements but are elements in the sense of each being a rudiment, which means a beginning; an initial or imperfect form or stage. As Kapustinsky says, the properties of ordinary elements are not yet associated with them.

H and He can be considered "proto-elements" in the sense that they were the first building blocks from which heavier elements were later formed through nucleosynthesis in stars. Kapustinsky says that the system is thus:

• a harmonious whole, with a beginning and end
• regular and symmetrical
• without exception, it embraces all of its constituent members with simple mathematical expressions

Social Issues, Periodic Table of

By www.wearedorothy.com, a Periodic Tables of Social Issues - Signed Limited Edition A tabular display of the worst elements of humankind. 1st edition print of 100.

Click to enlarge:

Thanks to Vicci for the tip!

Oliver Sacks, Uncle Tungsten: Memories of Tungsten of a Chemical Beyond

René Vernon writes:

On the paperback cover of Oliver Sack's Uncle Tungsten (below) the periodic table shows a 16–wide set of elements at its base. This is quite unusual since this set is normally shown as being 15— or 14— elements wide. See, for example, the table found on the site of the International Union of Pure & Applied Chemistry which shows a 15–wide set of elements at its base.

It looks like the second pair are La and Ac, but what then are two immediately preceding elements?

I suspect they are probably the alkaline earth metals, Ba and Ra. This may be an homage to Mr Rare Earth^ aka Karl A. Gschneidner Jr (1930–2016), who wrote that:

...since Ba has a 4f⁰6s² configuration, these three elements are the first (Ba), mid (Eu), and end (Yb) members of the divalent 4f transition series.

The notion of 4f⁰ is not unprecedented; the IUPAC periodic table, with its 15-wide f-block presumably implies La as 4f⁰ 5d¹ 6s².

There is some good chemistry going on here, given the pronounced similarities between Ba and the lanthanides, and the alkaline earth metals generally with about 20 properties involved:

• Most of the physical properties of Eu and Yb, "such as the atomic volumes, metallic radii, melting and boiling points, heats of sublimation, compressibilities, and coefficients of expansion are more like those of the alkaline-earth metals, Ca, Sr, and Ba, than those of the rare-earth metals" (Pauling 1960, p. 418; Gschneidner 1964, p. 286).
• Liquid ammonia dissolves certain alkali, alkaline earth, and Ln metals, and... combines with them to form solid compounds. Those metals whose compound-forming ability has been confirmed are Li, Ca, Sr, Ba, Eu and Yb. (Mammano (1970, p. 367)
• The lanthanides are sometimes regarded as trivalent versions of the alkaline earth metals (Evans 1982).
• The electron configurations of lanthanide cations are similar to those of alkaline earth metal cations, as the inner f- orbitals are largely or completely unavailable for bond formation; (Choppin & Rizkalla 1994)
• The lanthanide trivalent cations are essentially spherical and present an environment very similar to alkali and alkaline earth ions towards complex formation... the standard electrode potentials for the lanthanides have similar values and are comparable with the redox potentials of alkaline earth metals (Sastri et al. 2003)
• Ba-Eu-Yb have cubic crystalline structures whereas the rest of the Ln are hexagonal, or rhombohedral in the case of Sm (Russell & Lee 2005)
• There is a close alloying similarity between the lanthanides and Ca, Sr and Ba (Artini 2007)
• Lanthanides are effective mimics of calcium and can stimulate or inhibit the function of calcium-binding proteins (Brayshaw 2019)
• Lanthanide cations can substitute for Ca2+ and Sr2+ cations in host materials for solid state lasers (Ikesue 2013)
• There is a knight’s move relationship between Ca and La:
  • The ionic radius of Ca²⁺ is 114 pm; that of La³⁺ is 117 pm
  • The similarity in sizes means La³⁺ will compete with Ca²⁺ in the human body, and usually win on account of having a higher valence for roughly the same hydrated radius
  • The basicity of La₂O₃ is almost on par with CaO₂ Freshly prepared La2O3 added to water reacts with such vigour that it can be quenched like burnt lime (CaO)
  • The electronegativity of Ca is 1.0; that of La is 1.1.

Kudos to Oliver.

^Pecharsky 2016

Sources

• Artini C (ed.) 2017, Alloys and Intermetallic Compounds: From Modeling to Engineering, CRC Press, Boca Raton, p. 92
• Brayshaw et al. 2019, Lanthanides compete with calcium for binding to cadherins and inhibit cadherin-mediated cell adhesion, Metallomics, vol. 11, no. 5, 2019, pp. 914–924
• Choppin GR & Rizkalla EN 1994, Solution chemistry of actinides and lanthanides, Handbook on the Physics and Chemistry of Rare Earths, pp. 559–590(560)
• Evans WJ 1982, Recent advances in the low valent approach to f-element organometallic chemistry, in McCarthy GJ, Silber HB and Rhyne JJ (eds), The Rare Earths in Modern Science and Technology, vol. 3, Plenum Press, New York, pp. 61–70(62)
• Gschneidner KA 1965, in Seitz F & Turnbull D (eds), Solid State Physics, vol. 16, Academic Press, New York, p. 286
• Ikesue A, Aung YL, Lupei V 2013, Ceramic Lasers, Cambridge University Press, Cambridge, pp. 26, 28
• Mammano N 1970, Solid metal ammonia compounds, in Metal–Ammonia Solutions, Proceedings of an International Conference on the Nature of Metal–Ammonia Solutions: Colloque Weyl II, pp. 367-393 (367), https://doi.org/10.1016/B978-0-408-70122-8.50030-4
• Pauling L 1960, The Nature of the Chemical Bond, 3rd ed., Cornell University Press, Ithaca, p. 418
• Pecharsky V 2016, Karl A. Gschneidner Jr (1930–2016), Nature Materials, vol. 15, no. 1059, https://doi.org/10.1038/nmat4751
• Russell AM & Lee KL 2005, Structure-property relations in nonferrous metals, John Wiley & Sons, Hoboken, inside cover
• Sastri et al. 2003, Modern Aspects of Rare Earths and their Complexes, Elsevier, Amsterdam, pp. 377, 878

© Mark R. Leach Ph.D. 1999 –

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