Helium's placement in the Periodic Table from a crystal structure viewpoint

Kurushkin, Mikhail

doi:10.1107/s2052252520007769

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…elements, and Y can be related to the heavy group-3 (La, Ac) or group-3' (Lu, Lr) elements (see also Figure 4 ). While active chemists usually investigate the comprehensive group, there are authors who prefer to classify the border-case elements in a rigorous unique manner (Luchinskii and Trifonov, 1981 ; Jensen, 1982 , 2003 , 2015 ; Grochala, 2018 ; Petruševski and Cvetković, 2018 ; Chandrasekara et al, 2019 ; Kurushkin, 2020 ; Rayner-Canham, 2020 ; Scerri, 2020 ; Vernon, 2020b ). Anyhow, the bifurcations in the Periodic System are a basic aspect of empirical chemical periodicity (Bayley, 1882 ; Carnelley, 1886 ; Thomsen, 1895 ; Bohr, 1922 ; Hackh, 1924 ; Von Antropoff, 1926 ; Clark, 1933 , 1950 ; Shchukarev, 1954 ).…”

Section: The Emergence Of Naturally 2-dimensional Tables Of Chemical mentioning

confidence: 99%

Understanding Periodic and Non-periodic Chemistry in Periodic Tables

et al. 2021

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The chemical elements are the “conserved principles” or “kernels” of chemistry that are retained when substances are altered. Comprehensive overviews of the chemistry of the elements and their compounds are needed in chemical science. To this end, a graphical display of the chemical properties of the elements, in the form of a Periodic Table, is the helpful tool. Such tables have been designed with the aim of either classifying real chemical substances or emphasizing formal and aesthetic concepts. Simplified, artistic, or economic tables are relevant to educational and cultural fields, while practicing chemists profit more from “chemical tables of chemical elements.” Such tables should incorporate four aspects: (i) typical valence electron configurations of bonded atoms in chemical compounds (instead of the common but chemically atypical ground states of free atoms in physical vacuum); (ii) at least three basic chemical properties (valence number, size, and energy of the valence shells), their joint variation across the elements showing principal and secondary periodicity; (iii) elements in which the (sp)8, (d)10, and (f)14valence shells become closed and inert under ambient chemical conditions, thereby determining the “fix-points” of chemical periodicity; (iv)peculiar elements at the top and at the bottom of the Periodic Table. While it is essential that Periodic Tables display important trends in element chemistry we need to keep our eyes open for unexpected chemical behavior in ambient, near ambient, or unusual conditions. The combination of experimental data and theoretical insight supports a more nuanced understanding of complex periodic trends and non-periodic phenomena.

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Section: The Emergence Of Naturally 2-dimensional Tables Of Chemical mentioning

confidence: 99%

Understanding Periodic and Non-periodic Chemistry in Periodic Tables

et al. 2021

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The location and composition of Group 3 of the periodic table

Vernon¹

2020

Found Chem

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Group 3 as Sc–Y–La, rather than Sc–Y–Lu, dominates the literature. The history of this situation, including involvement by the IUPAC, is summarised. I step back from the minutiae of physical, chemical, and electronic properties and explore considerations of regularity and symmetry, natural kinds, and quantum mechanics, finding these to be inconclusive. Continuing the theme, a series of ten interlocking arguments, in the context of a chemistry-based periodic table, are presented in support of lanthanum in Group 3. In so doing, I seek to demonstrate a new way of thinking about this matter. The last of my ten arguments is recast as a twenty-word categorical philosophical (viewpoint-based) statement.

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Helium's placement in the Periodic Table from a crystal structure viewpoint

Cited by 2 publications

References 19 publications

Understanding Periodic and Non-periodic Chemistry in Periodic Tables

Understanding Periodic and Non-periodic Chemistry in Periodic Tables

The location and composition of Group 3 of the periodic table

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