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The Number of Possible Elements and Mendeléff's “Cubic” Periodic System

Nature volume 87, page 78 (20 July 1911) | Download Citation



ACCORDING to Rutherford's theory of “single scattering” (“On the Scattering of α and β Particles by Matter and the Structure of the Atom,” Phil. Mag., May, 1911), and to Barkla's “Note on the Energy of Scattered X-Radiation” (ibid.), the numbers of electrons per atom is half the atomic weight; thus, for U, about 120. Now, a reconstruction of Mendel eff's “cubic” periodic system, as suggested in his famous paper “Die Beziehungen zwisehen den Eigenschaften der Elemente und ihren Atomgewichten” (Ostw. Klass., No. 68, pp. 32, 36, 37, and 74), gives a constant mean difference between consecutive atomic weights =2, and thus, from H to U, 120 as the number of possible elements (van den Broek, “Das Mendelejeff'sche ‘Kubische’ Periodische System der Elemente und die Einordnung der Radioelemente in dieses System,” Physik. Zeitschr. 12, p. 490). Hence, if this cubic periodic system should prove to be correct, then the number of possible elements is equal to the number of possible permanent charges of each sign per atom, or to each possible permanent charge (of both signs) per atom belongs a possible element.

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  1. Noordwijk-Zee, June 23.



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