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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: 

  Text Search:       

Year:  2004 PT id = 124

Material Type Periodic Table

All of the the main group elements are common laboratory reagents or chemical in bottles. They appear as metals, metalloid (semi-metals) and non-metals. Most of the non-metals are molecular materials while most of the metalloids have an extended network-covalent structure.

Elsewhere in the chemogenesis web book, material type is discussed in terms of the Laing Tetrahedron, an analysis that classifies binary materials in terms of four extreme types: metallic, ionic, molecular and network. However, none the chemical elements present as ionic materials, only as metals, molecular (van er Waals) and network materials:

The elements B, C, Si, P, S, Ge, As, Se, Sn, Sb and Te can form allotropes: pure elemental substances that can exist with different crystalline structures from the Wikipedia. Allotropes may be metallic, network or molecular.

By Mark Leach

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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