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MOSELEY, Henry Gwyn Jeffreys. The high-frequency spectra of the elements / The High-Frequency Spectra of the Elements. Part II. In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Sixth series, vol.26, no. 156 (December 1913), pp. 1024-1034, plate XXIII; and Sixth series, vol.27, no. 160 (April 1914), pp. 703-713. [Bound with]: II. BOHR, Niels. On the Constitution of Atoms and Molecules. 3 parts. In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Sixth series, vol.26 (July-December 1913), pp. 1-25, 476-502 and 857-75. London: Taylor and Francis, 1913-1914. 2 volumes, 8vo (210x140 mm). Whole volumes: viii, 1064 pp., 23 plates, Sept. issue misbound at end; viii, 1044 pp., 16 plates. Contemporary half cloth (spine sun-faded, boards somewhat rubbed and scuffed). Rear inner joint of vol. 26 broken; endpapers with library stamps, title stamped, slightly browned. Margins of some plates occasionally shaved (not affecting plate to Meseley's paper). Provenance: Bundesamt für Eich- und Vermessungswesen (bookplates with shelf numers to front pastedowns and stamps to general title pages). Good set with the important milestone papers. ---- I. DSB IX, 542; PMM 407; Norman 1559 - FIRST EDITION of Moseley's breakthrough work which placed the atomic table on a firm scientific foundation. "Moseley, working under Rutherford at Manchester, used the method of X-ray spectroscopy devised by the Braggs to calculate variations in the wavelength of the rays emitted by each element. These he was able to arrange in a series according to the nuclear charge of each element. Thus if the nuclear charge of hydrogen is 1, in helium it is 2, in lithium 3, and so on by regular progression to uranium as 92. These figures Moseley called atomic numbers. He pointed out that they also represented a corresponding increase in extra-nuclear electrons and that it is the number and arrangement of these electrons rather than the atomic weight that determines the properties of an element. It was now possible to base the periodic table on a firm foundation, and to state with confidence that the number of elements up to uranium is limited to 92. When Moseley's table was completed, six atomic numbers had no corresponding elements; but Moseley himself was able to predict the nature of four of the missing elements" (PMM 407) II. DSB II, 239; PMM 411; Norman 258 - FIRST EDITION."Bohr's three-part paper postulated the existence of stationary states of an atomic system whose behavior could be described using classical mechanics, while the transition of the system from one stationary state to another would represent a non-classical process accompanied by emission or absorption of one quantum of homogeneous radiation, the frequency of which was related to its energy by Planck's equation" (Norman).
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