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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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What is the Periodic Table Showing?

Periodicity

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. The database hold information on periodic tables, the discovery of the elements and elucidation of atomic weights (and more).

Use the drop menus or search box (below) to search & select from the more than 1350 Period Tables in the database:

Year: 1949

PT id = 1018, Type = formulation 3D

Scherer's Student Model of Spiral Periodic Chart

George A. Scherer, New Aids for Teaching the Periodic Law, School Science and Mathematics, vol. 49, no. 2 (1949).

René Vernon writes:

"This is a Left-Step periodic table with a split d-block, that can be rearranged into a cylinder. Students were expected to keep a copy of the two halves of the table in their note books, for reassembly as required. It was a clever way of introducing the 32-column form, and the transition from 2D to 3D (that faded into obscurity)":

Thanks to René for the tip!

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© Mark R. Leach Ph.D. 1999 –

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