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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 holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).

Use the drop menus or search box (below) to Select or Search the 1400 entries in the database:

Year: 2019

PT id = 1069, Type = formulation 3D

Alexander Arrangement Unwrapped... and Rewrapped

In mid-2019 Roy Alexander – of the Alexander Arrangement – produced an intriguing new formulation in sketch form that shows the p, d & f blocks moving away from the s block in three dimensional space:

Roy has now expanded this into a full blown new formulation. (Click image to enlarge):

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© Mark R. Leach Ph.D. 1999 –

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