Reduction of the periodic table

The paper resulted from an invitation to contribute to what eventually became a three-volume dedication to the memory of Lowdin. In addition to addressing the question of whether the n + rule has been derived, I used this opportunity to explore the reduction of the periodic table in more general terms. 

THREE POSSIBLE APPROACHES TO THE REDUCTION OF THE PERIODIC TABLE... 

Recently Rouvray has re-emphasized how quantum mechanics does not provide a true reduction of the periodic table. D. H. Rouvray (1996), The Surprising Periodic Table Ten Remarkable Facts , Chemical Intelligencer, July. 39-47. 

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