Abstract
VALENCY and X-ray spectra may appear to have little in common, but valency is essentially connected with the number and distribution of the outer electrons of the atom, while X-ray spectra provide the most powerful weapon for the investigation of those which are more tightly bound; together, therefore, these two essays involve the whole question of electron distribution. The first section contains an interesting account of the various theories of valency, and considerable space is devoted to the bearing of the crystal lattice on the problem. This new edition has been slightly enlarged, notably by the inclusion of a brief account of the Lewis-Langmuir theory. Bohr's work on the periodic table is not discussed here, since the author has decided, rightly perhaps, that it could be treated more adequately in the second essay. Here Dr. Kossel has succeeded in giving, in small compass, an admirable account of X-ray spectra and their bearing on atomic structure. He emphasises the fact that an investigation of the energy levels indicated by these spectra leads to conclusions similar to those deduced from valency considerations. The first edition was deservedly popular, and no doubt this second edition will meet with equal success, giving, as it does, a clear yet concise account of these phenomena.
Valenzkräfte und Röntgenspektren: zwei Aufsätze über das Elektronengebäude des Atoms.
Prof. Dr.
W.
Kossel
Von. Zweite, vermehrte Auflage. Pp. iv + 89. (Berlin: Julius Springer, 1924.) 3.60 gold marks.
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Valenzkräfte und Röntgenspektren: zwei Aufsätze über das Elektronengebäude des Atoms . Nature 116, 44 (1925). https://doi.org/10.1038/116044c0
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DOI: https://doi.org/10.1038/116044c0