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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  Chemogenesis Paper 6.4  Electronegativity as a Basic Elemental Property 6.5  What is Chemistry? (Workshop) 6.6  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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  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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Periodic Tables from the year 2006:

Where Should Hydrogen Go?

There are four possible positions for hydrogen:

• A Group 1 element, above Li, because it forms H⁺ ions.
• A Group 17 element, above F, because it forms H^- ions.
• Above and between boron and carbon because it is of intermediate electronegativity.
• In the top middle, because nowhere else is ideal.

By Mark Leach

Eric Scerri's Triad Periodic Table

Eric Scerri says, "I have recently developed a new periodic table with some very nice features. I am now shifting my allegiance from the left-step table to this one."

• New design based on the fundamental nature of triads, and on atomic number triads in particular.
• H,F,Cl is a new perfect atomic number triad not featured in the usual medium-long form table. There are also many chemical arguments for placing H among the halogens rather than the alkalis.
• Note the regularity regarding period lengths. 8, 8, 18, 18, 32, 32 ...
• All period lengths repeat without fail, unlike in the medium-long form.
• Also note the bi-lateral symmetry assuming the rare earths are given as a footnote.

Read the paper on the philosophy of science web site.

Eric Scerri, The Periodic Table: Its Story and Its Significance, Oxford University Press, 2006. Read an interview with the author, here, and a review of the book here.

Homeopathic

A Homeopathic Periodic Table by Jan Scholten.

From his book Geheime Lanthanide (Secret Lanthanides) 2006. The basic idea is that successive elements in each series ( = row) are like the stages in a heroic story like the labours of Hercules or the voyages of Odysseus, each one appropriate to meet a different challenge.

ADOMAH Periodic Table by Valery Tsimmerman

The ADOMAH periodic table is based on the Janet or left-step periodic table. It consists of four blocks (s, p, d & f) corresponding to quantum numbers l = 0,1,2,3. Blocks are separated, shifted and reconnected with each other via diagonal lines. This arrangement creates "layers" or "strata" that retain continuity in respect to atomic number Z, in addition to usual columns and rows. Therefore, numbers shown on the right hand side of the table may represent either quantum numbers n (electronic shells) if horizontal rows are followed, or n + l if "layers" or "strata" are followed.

This feature assists in creation of electronic configurations of the elements. Elements H and He are placed in two positions that reflect their dual nature and give proper consideration to atomic structure and chemical properties of those two elements. This feature also preserves triads He, Ne, Ar and H, F, Cl. Also, the elements are placed in rectangular "boxes", so any two of such "boxes" make up a square thus symbolising electron pairs. This also cuts table length in half. Unlike the Janet table, this table is assembled from bottom up in direction of increase of quantum number n, as well as atomic weight and energy. The ADOMAH table has symmetry and, assuming total number of elements 120, can be divided in four parts of 30 elements with center point located among precious metals.

The Wikipedia Alternative Periodic Table

On the Wikipedia there is another circular form of periodic table:

Henry Bent's Exploration into Janet's Left-Step Formulation

Henry Ben't detailed exploration into the Left-Step formulation of the periodic table is available as a book:

Reaction Chemists' Periodic Table

OK, so which Is The Best formulation of The Periodic Table?

Personally as a reaction chemist, my preferred periodic table is the 'long' form shown below, with hydrogen above and between boron and carbon, although clearly other scientists have other ideas.

All periodic tables show the increase in mass and atomic number, Z, but only the long form unambiguously shows the general top-right-to-bottom-left trends in electronegativity, atomic radius, metallic properties and first ionisation energy.

Electronegativity is absolutely crucial to the understanding of structure, bonding, material type (van Arkel-Ketelaar triangle and Laing tetrahedron) and chemical reactivity, and it underpins much of the chemogenesis analysis.

Eric Scerri's The Periodic Table & Its Significance

Eric Scerri, The Periodic Table: Its Story and Its Significance, Oxford University Press, 2006. Read an interview with the author, here, and a review of the book here.

Element Collection Periodic Table

It is possible to buy sets of elements presented as a periodic table from RGB Research Ltd.

Radioactivity Periodic Table

A periodic table showing the elements that have no stable isotopes, so that all samples are radioactive:

By Mark Leach

Superconducting Elements

A periodic table showing which elements become superconducting at low temperature.

By Mark Leach

Group Numbering Systems

IUPAC

Phase State: Solid, Liquid, Gas at 20°C & 700°C

By Mark Leach

Astronomer's Periodic Table

Highly amusing for chemists is the astronomer's periodic table because astronomers consider there to be three types of element:

• hydrogen
• helium
• metal

  Yup, cosmologists and other professional star gazers consider all elements, atomic number three and up, to be metals.

By Mark Leach

Beer Styles

A periodic table of Beer Styles from Mantis Design:

Elements in Fireworks

Fireworks rely on the chemical characteristics of the elements that are used to make them. This special periodic table highlights the elements that have significance to fireworks and pyrotechnics:

Vienna Chicago Style Hot Dog Condiments

A periodic table of Vienna Chicago Style Hot Dog Condiments:

The Neutronic Schemata: Specialized Schemata of the Elements

Console Controllers

A periodic table of console (game) controllers, here. Click here for a larger version.

Look Around You Periodic Table

A spoof periodic table form the BBC comedy science program, Look Around You:

You will need to click here to see the full size graphic and spot the jokes, for example :

The Periodic Table Mysteries

In this series, Dr. Gloria Lamerino, retired physicist back from California, moves into an apartment above a funeral home in Revere, Massachusetts. When she signs on to help the Police Department in science-related homicides, she doesn't realize she may have 109 cases ahead of her...

Various Periodic Tables

As discussed on this page of the Chemogenesis webbook, the periodic table is ambiguous as to what it is showing.

Does the PT show the element as the abstract 'basic substance', or gas phase atoms or the material substance?

By Mark Leach

Lego: Periodic Table

A Lego Periodic Table:

Bent's PlN and Ple (Front Step) Periodic Tables

In his book, New Ideas in Chemistry from Fresh Energy for the Periodic Law, here, Henry Bent introduces the PlN and Ple (Front Step) Periodic Tables, Figs 50 & 52:

Harmonic Circle & Spiral of the Chemical Elements

Brian David Andersen of Tri-Vortex Technology (Researcher/Inventor/Scientist), Subtle Energy Products trivortex.com:

Demers' Système du Québécium

Updated from this 2002 entry comes: Quebec System, Numbers and geometry in the classification of the elements by Pierre Demers.

Demers writes:

"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."

Read [much] more on this page of links:

Thanks to Conal for the tip!

Nandor's Exhaustive Lists of Chemical Words

From a really interesting PT website, Mark Nandor's Exhaustive Chemical Words:

So what, exactly, is a "chemical word"? It is an English word that can be spelt using element symbols as 'letters', [famously] for example: Beer (or BeEr):

Arches can be "spelt" in two ways:

ArCHeS   [Argon, Carbon, Helium, Sulfur]
ArCHEs   [Argon, Carbon, Hydrogen, Einsteinium]

On the other hand, there is no way at all to "spell" a work like pillar.

Mark Nandor provides several exhaustive lists:

• All 44,313 English words that can be spelled with element symbols.
• The various ways these can be spelt with element symbols (93,604 ways).
• 264 First Names
• etc.

© Mark R. Leach Ph.D. 1999 –

Queries, Suggestions, Bugs, Errors, Typos...

If you have any:

Queries
Comments
Suggestions
Suggestions for links
Bug, typo or grammatical error reports about this page,

please contact Mark R. Leach, the author, using mark@meta-synthesis.com

This free, open access web book is an ongoing project and your input is appreciated.