MOSELEY, Henry Gwyn Jeffreys (1887-1915). "The High-Frequency Spectra of the Elements," in: The London, Edinburgh and Dublin Philosophical Magzine , Sixth Series, Vol. 26, No. 156, pp. 1024-1034; and Vol. 27, No. 160, pp. 703-713. London: Taylor and Francis, December 1913 and April 1914. 2 volumes, 8 o (225 x 147 mm). Illustrated. Original blue printed wrappers, partly unopened and uncut; cloth folding case. FIRST APPEARANCE 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...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" (PMM). PMM 407; Norman 1559.
MOSELEY, Henry Gwyn Jeffreys (1887-1915). "The High-Frequency Spectra of the Elements," in: The London, Edinburgh and Dublin Philosophical Magzine , Sixth Series, Vol. 26, No. 156, pp. 1024-1034; and Vol. 27, No. 160, pp. 703-713. London: Taylor and Francis, December 1913 and April 1914. 2 volumes, 8 o (225 x 147 mm). Illustrated. Original blue printed wrappers, partly unopened and uncut; cloth folding case. FIRST APPEARANCE 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...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" (PMM). PMM 407; Norman 1559.
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