Alfred Werner: Overlooked Genius of the Periodic System

AbstractThe data concerning the formulation of the Periodic Law and certain graphic variants of its interpretation, proposed at different times for 150 years from the moment of the opening of this law, have been presented and discussed. It was stated that, despite the presence of a very significant (several hundred) number of these variants, only two tabular versions of the Periodic Table of chemical elements, namely, the so-called “short-periodic” proposed by Dmitri Mendeleev and the so-called “long-periodic” proposed by Alfred Werner (which was recommended in the fullness of time by the International Union of Pure and Applied Chemistry), received practical applications. A modification of the indicated tabular variants, aimed at overcoming their shortcomings, has been proposed. The question of the existence of the upper boundary of the Periodic System and the probable prospects for obtaining super-heavy elements with a nuclear charge of Z > 110, in particular a new category of them – 5g-elements, has been also discussed.

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Study of charge transfer in FeTi

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075270 ◽

1983 ◽

Vol 41 ◽

pp. 296-297

Author(s):

J. Taft∅

Keyword(s):

Charge Transfer ◽

Charge Distribution ◽

Electron Scattering ◽

Periodic System ◽

Electron Distribution ◽

Scattering Amplitude ◽

Transition Elements ◽

Hartree Fock ◽

Cscl Structure ◽

The Right

It is well known that for reflections corresponding to large interplanar spacings (i.e., sin θ/λ small), the electron scattering amplitude, f, is sensitive to the ionicity and to the charge distribution around the atoms. We have used this in order to obtain information about the charge distribution in FeTi, which is a candidate for storage of hydrogen. Our goal is to study the changes in electron distribution in the presence of hydrogen, and also the ionicity of hydrogen in metals, but so far our study has been limited to pure FeTi. FeTi has the CsCl structure and thus Fe and Ti scatter with a phase difference of π into the 100-ref lections. Because Fe (Z = 26) is higher in the periodic system than Ti (Z = 22), an immediate “guess” would be that Fe has a larger scattering amplitude than Ti. However, relativistic Hartree-Fock calculations show that the opposite is the case for the 100-reflection. An explanation for this may be sought in the stronger localization of the d-electrons of the first row transition elements when moving to the right in the periodic table. The tabulated difference between fTi (100) and ffe (100) is small, however, and based on the values of the scattering amplitude for isolated atoms, the kinematical intensity of the 100-reflection is only 5.10-4 of the intensity of the 200-reflection.

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Element 103 of the periodic system

Annales de Physique ◽

10.1051/anphys/196814030331 ◽

1968 ◽

Vol 14 (3) ◽

pp. 331-339 ◽

Cited By ~ 3

Author(s):

E. D. Donets ◽

V. A. Druin ◽

V. L. Mikheev

Keyword(s):

Periodic System

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Stress state of piece-wise homogeneous space with doubly-periodic system of interphase defects.

Mechanics - Proceedings of National Academy of Sciences of Armenia ◽

10.33018/69.3.1 ◽

2016 ◽

Vol 69 (3) ◽

pp. 3-15 ◽

Cited By ~ 1

Author(s):

. HakobyanV.N ◽

L.V. Hakobyan

Keyword(s):

Stress State ◽

Homogeneous Space ◽

Periodic System

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The stability of heavy nuclei and the limit of the periodic system of elements

Uspekhi Fizicheskih Nauk ◽

10.3367/ufnr.0100.197001b.0045 ◽

1970 ◽

Vol 100 (1) ◽

pp. 45-92 ◽

Cited By ~ 15

Author(s):

G.N. Flerov ◽

V.A. Druin ◽

A.A. Pleve

Keyword(s):

Periodic System ◽

Heavy Nuclei ◽

The Stability

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17O, 13C, and 29Si NMR spectra of some acyloxy- and diacetoxysilanes and acetoxygermanes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19862582 ◽

1986 ◽

Vol 51 (11) ◽

pp. 2582-2589 ◽

Cited By ~ 16

Author(s):

Antonín Lyčka ◽

Jaroslav Holeček ◽

Karel Handlíř ◽

Josef Pola ◽

Václav Chvalovský

Keyword(s):

Periodic System ◽

Time Scale ◽

Nmr Spectra ◽

Group Element ◽

29Si Nmr ◽

Carboxyl Group ◽

29Si Nmr Spectra ◽

Oxygen Atoms

The 17O, 13C, and 29Si NMR spectra of (CH3)3SiOC(O)R, CH3(XCH2)Si(OC(O)CH3)2, and R3GeOC(O)CH3 compounds are reported. In the 17O NMR spectra at 350 K the only signal is observed with the two latter series, but two well-resolved signals are displayed with the (CH3)3SiOC(O)R compounds. The equivalence of both oxygen atoms in carboxyl group on the NMR time scale is discussed from the viewpoint of a possible coordination of the oxygen atoms to the IVB group element of the periodic system.

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