Die Stellung von Beryllium und Magnesium im periodischen System der Elemente

Pfeiffer, P.; Fleitmann, Theodor; Hansen, R.

doi:10.1002/prac.19301280103

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…Pfeiffer's table preceded better known Deming's Table (1923) and is more similar to today's standard table. He later changed the positions of Be and Mg to the group 2 above Ca (Pfeiffer et al 1930). It is interesting to note that in the biographical articles on Werner (Pfeiffer 1928) and on Pfeiffer (Oesper 1951), there is no mention of their contributions to the development of new types of the periodic tables.…”

Section: Pioneering Work Towards Modern Long-form Periodic Tables: Wementioning

confidence: 99%

Three related topics on the periodic tables of elements

2020

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A large variety of periodic tables of the chemical elements have been proposed. It was Mendeleev who proposed a periodic table based on the extensive periodic law and predicted a number of unknown elements at that time. The periodic table currently used worldwide is of a long form pioneered by Werner in 1905. As the first topic, we describe the work of Pfeiffer (Naturwiss. 8:984-991, 1920), who refined Werner's work and rearranged the rare-earth elements in a separate table below the main table for convenience. Today's widely used periodic table essentially inherits Pfeiffer's arrangements. Although long-form tables more precisely represent electron orbitals around a nucleus, they lose some of the features of Mendeleev's short-form table to express similarities of chemical properties of elements when forming compounds. As the second topic, we compare various three-dimensional (3D) helical periodic tables that resolve some of the shortcomings of the long-form periodic tables in this respect. In particular, we explain how the 3D periodic table "Elementouch" (Maeno in Periodic-table-of-the-elements stationery. Design No. 1149493, Japan Patent Office. https ://www.j-platp at.inpit .go.jp/d0000 , 2001), which combines the sand p-blocks into one tube, can recover features of Mendeleev's periodic law. Finally we introduce a topic on the recently proposed nuclear periodic table based on the proton magic numbers (Hagino and Maeno in Found Chem 22:267-273, 2020). Here, the nuclear shell structure leads to a new arrangement of the elements with the proton magicnumber nuclei treated like noble-gas atoms. We show that the resulting alignments of the elements in both the atomic and nuclear periodic tables are common over about two thirds of the tables because of a fortuitous coincidence in their magic numbers.

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Section: Pioneering Work Towards Modern Long-form Periodic Tables: Wementioning

confidence: 99%

Three related topics on the periodic tables of elements

2020

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“…In keeping with its covalency maximum 4, many of its salts crystallize with four molecules of water of crystallization. The benzenesulfonates and naphthalenesulfonates are, however, exceptional in having six molecules of water of crystallization (15). Other work of Pfeiffer (16) makes it improbable that this surplus is associated with the negative ion.…”

Section: Coordination Compoundsmentioning

confidence: 99%