Abstract
A MODERN table of chemical elements must show electronic configurations as well as the variation in the properties of the elements with atomic number. It should also include the lanthanide and actinide series of elements. The trend has been to lengthen the table (for example in the conventional long form and in Simmons' Table1) and so abolish the sub-group system. In the Table shown herewith the rectangular form has been preserved and a three sub-group system introduced.
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References
Simmons, L. M., J. Chem. Educ., 24, 588 (1947) ; 25, 658 (1948).
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CLIFFORD, A. Periodic Classification of Elements. Nature 184, 2012 (1959). https://doi.org/10.1038/1842012a0
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DOI: https://doi.org/10.1038/1842012a0
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