Studien über die Componenten der Absorptionsspectra erzeugenden seltenen Erden

Krüss, Gerhard; Nilson, L. F.

doi:10.1002/cber.18870200212

Cited by 15 publications

(4 citation statements)

References 1 publication

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“…Nilson, who isolated scandium by separating it from the more basic ytterbium (316, 318, 320, 322), separated relatively pure ytterbium (317,319,321), and removed thorium from rare earth mixtures (236,237,323) by means of the procedure; and Urbain, who found that it was not suited to the fractionation of the terbium earths (399) but was suited to the isolation of ytterbium and thorium in the least basic fractions and yttrium in the most basic (405) and to the elimination of most of the yttrium from the earths (403). Auer von Welsbach (422) believed the process to be the best known (at that time) for the separation of large amounts of erbium from yttrium, although he recognized that the last traces of erbium could not be so removed, von Welsbach also used the method to concentrate scandium and ytterbium in fractions less basic than erbium and to separate the cerium earths from the less basic yttrium earths.…”

Section: Hydrolysis Of Azidesmentioning

confidence: 99%

The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements.

Moeller¹,

Kremers²

1945

Chem. Rev.

113

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Section: Hydrolysis Of Azidesmentioning

confidence: 99%

The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements.

Moeller¹,

Kremers²

1945

Chem. Rev.

113

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“…Gerhard Krüss (1859Krüss ( -1895 and Lars Fredrik Nilson (1840-1899) firmly supported the idea that the "old" didymium should be considered a mixture of nine elements [9]. At the beginning of the 20th century, Bohuslav Brauner (1855Brauner ( -1935 announced that he had discovered a fraction containing element 61 [10] among the products of many fractional crystallizations.…”

Section: The Ill-fated Rare Earthmentioning

confidence: 99%

Chemists and physicists behaving badly: The shadow side of two elemental discoveries

Fontani¹,

Orna²,

Costa³

2020

Comptes Rendus. Chimie

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It is appropriate to recall that 2019 was the year dedicated to the Periodic Table. But when we speak about false elements-in the aftermath of the celebrations marking this year,-we are greeted most warmly, but with some puzzlement, as to how it came to mind to celebrate "Mendeleev's creature" in such a peculiar way, that is, by commemorating elements that never existed. In the course of many years, we have discovered and collected a great number of discoveries of simple bodies that sooner or later turned out to be detours or false tracks. Résumé. Il convient de rappeler que 2019 a été l'année consacrée au tableau périodique. Mais quand nous parlons de faux éléments-au lendemain des célébrations de cette année-nous sommes accueillis très chaleureusement, mais avec un peu de perplexité quant à l'idée de célébrer la "créature de Mendeleïev" d'une manière si particulière, c.-à-d., en commémorant des éléments qui n'ont jamais existé.

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“…Thus, the two German rare-earth chemists Gerhard Krüss and L.F. Nilson stated that "according to our present knowledge about the samarium and didymium compounds we cannot doubt that they are compounds of two distinct bodies." 56 The acceptance of this viewpoint of course would result in the periodic system losing its meaning, because a large number of allegedly new chemical elements, some identical in atomic weight to others,* would be added to it. 57 A third possibility (though an improbable one) considered by Crookes was Lecoq de Boisbaudran's proposal that the substances emitting the phosphorescent spectra were impurities in the yttrium samples.…”

Section: Crookes's Involvementmentioning

confidence: 99%

Are the Elements Elementary? Nineteenth-Century Chemical and Spectroscopical Answers

Leone

Robotti

2003

Physics in Perspective (PIP)

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We analyze the role and influence of a tradition of research linked to the concept of "primary matter" in nineteenth-century studies on the nature of the elements. The suggestion of William Prout in 1816 that the atomic weights of pure chemical elements are whole numbers and multiples of the atomic weight of hydrogen, taken as unity, was met with serious confutations, which in turn prompted several attempts to save Prout's hypothesis. We discuss these attempts in detail and the objections raised against them, for instance by Dmitry Ivanovich Mendeleev . We pay particular attention to the use of spectroscopy as a method for proving the existence of elementary forms of matter inside atoms. Leaders in this field of research were two English scientists, the astrophysicist Norman Lockyer (1836-1920) and the chemist William Crookes (1832-1919). Both of their approaches involved the idea of primary matter. However, while Crookes's approach proved to be incorrect, Lockyer's ideas survived for several years and supported the discovery of the electron by J.J. Thomson (1856Thomson ( -1940. nine years later was awarded the Nobel Prize in Physics for his work on the conduction of electricity through gases, introduced a new concept of matter: on this view we have in the cathode rays matter in a new state, a state in which the subdivision of matter is carried very much further than in the ordinary gaseous state: a state in which all matter-that is, matter derived from different sources such as hydrogen, oxygen, etc.-is of one and the same kind; this matter being the substance from which all the chemical elements are built up. 1

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Studien über die Componenten der Absorptionsspectra erzeugenden seltenen Erden

Abstract: a) Compt. rend. 91, 378. *) Ofversigt af I<. Wctenskaps Akaderniens FBrhandlingar. 5) Monatshefte der Chemie 6, 477.

Cited by 15 publications

References 1 publication

The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements.

The Basicity Characteristics of Scandium, Yttrium, and the Rare Earth Elements.

Chemists and physicists behaving badly: The shadow side of two elemental discoveries

Are the Elements Elementary? Nineteenth-Century Chemical and Spectroscopical Answers

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