114999-01
The high-frequency spectra of the elements. SS. 1024-1034. Mit 1 Abbildung. In: Philosophical Magazine, 6th series. Vol. 26, No. 156.
London, Taylor & Francis, 1913. - (22,5 x 15 cm). SS. 937-1064, VIII S. Mit Abbildungen und Tafeln. Original-Broschur, unaufgeschnitten.
Erste Ausgabe des ersten Teils von Moseleys berühmter Arbeit zur Bestimmung der Ordnungszahl der Elemente, ein Meilenstein in der Entwicklung der Atomphysik. - "Moseley, working under Rutherford in 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 periodical 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). - Gut erhaltenes und fleckenfreies Exemplar. - DSB 9, 542; PMM 407; Norman 1559
The high-frequency spectra of the elements. SS. 1024-1034. Mit 1 Abbildung. In: Philosophical Magazine, 6th series. Vol. 26, No. 156.
London, Taylor & Francis, 1913. - (22,5 x 15 cm). SS. 937-1064, VIII S. Mit Abbildungen und Tafeln. Original-Broschur, unaufgeschnitten.
Erste Ausgabe des ersten Teils von Moseleys berühmter Arbeit zur Bestimmung der Ordnungszahl der Elemente, ein Meilenstein in der Entwicklung der Atomphysik. - "Moseley, working under Rutherford in 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 periodical 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). - Gut erhaltenes und fleckenfreies Exemplar. - DSB 9, 542; PMM 407; Norman 1559
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