Development of the Periodic Chart

diverse variations of periodic tables

proposed in the 20th Century


Development of the periodic chart continues.  Once that it was established that there is both a linear progression of elements and periodic reoccurring similarities, many people found creative ways to emphasize a variety of relationships.  In addition to a wide assortment of spirals and flat tables were three dimensional trees, flowers, spheres, cubes, towers and other shapes.

Mark R. Leach at has compiled an extensive list of such variations of periodic tables which may be accessed by clicking the Next corner below right →.  (Caution: that web page is rather large and so may be very slow to load; patience!)

Before departing this site, a final caution:  Often the detail of daily life obscures accomplishments of our time.  Be cautious.  A summary such as has been provided here must leave much detail unwritten.  Many other ideas were proposed, provided the basis for thought and experiment, but eventually were rejected.  The Greek four element theory, and phlogiston are examples that contributed much to our understanding but are no longer viewed correct.  Not understanding history, one might believe current theories are TRUE!  But perhaps TRUTH should be reserved for ideas that can be logically proven.  A typical theory can never be proven TRUE.  Rather, evidence is gathered to support theories.  Our best test is whether our theories are useful.

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created 19 March 2002
latest revision 16 March 2008
by D Trapp
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