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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.

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Tottle's Periodic Table

Tottle CR 1974, The Science of Engineering Materials, reprint of 1966 ed., Heinemann Educational Books, London, p. 20

René Vernon writes:

I was drawn to the attached periodic table by the strange-looking arrangement of dividing lines, one "full" and one dashed, in the p-block.

Semimetals

Ge, As, Se, Sn, Sb, Te, Bi and Po are shown as semi-metals. Tottle does not explain the basis for this division.

Showing Sn as a semi-metal or metalloid is dubious. Sure, white-Sn becomes gray-Sn at a temperature of below 13.2 °C but even here it has the electronic band structure of a semi-metal.

The same can be said for Po which has electronic band structure of a true metal, unlike the situation in As, Sb and Bi, all of which have electronic band structures of semi-metals.

Metals & Nonmetals

Starting with H, note the left to right path of the full dividing line between metals and nonmetals is continuous, except for the unique break above Be, presumably to show that there is no element above Be. This is actually not well thought-out since the metallic or nonmetallic status of the IIA elements is not then clarified.

Tottle is further interesting since, as well as referring to metals and nonmetals in the periodic table sense he later includes a chapter on Metals and alloys, and a chapter on Non-metallic materials. Some examples given by him of non-metallic materials are alumina, magnesia, graphite, beryllia, titanium carbide, glass, rubber, nylon and wood. So, he here is mixing nonmetallic elements and nonmetallic materials (which is fine).

Tottle gets into trouble in his chapter on Metals and alloys, since he includes some discussion on interstitial solid solutions, such as cementite Fe₃C, which is an insulator, and intermetallic compounds, which appears fine on the surface, until one realises that some intermetallic compounds are semiconductors, such as FeGa₃, RuGa₃, and IrGa₃. I have never heard of semiconducting or insulating metals or alloys.

© Mark R. Leach Ph.D. 1999 –

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