Intra-atomic Charge

  title={Intra-atomic Charge},
  author={Frederick Soddy},
  • F. Soddy
  • Published 1 December 1913
  • Physics
  • Nature
THAT the intra-atomic charge of an element is determined by its place in the periodic table rather than by its atomic weight, as concluded by A. van der Broek (NATURE, November 27, p. 372), is strongly supported by the recent generalisation as to the radio-elements and the periodic law. The successive expulsion of one α and two β particles in three radio-active changes in any order brings the intra-atomic charge of the element back to its initial value, and the element back to its original… 
The van den Broek Hypothesis
In the development of the study of the atomic structure during the 1910's, the foundation of models of the atom was provided by van den Broek's hypothesis. The van den Broek hypothesis states that
Introduction to Isotope Effect
An atom consists of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged electrons. Although typically the nucleus is less than one ten-thounsandth the size of
Isotope - Based Material Science
As is well - known isotopes of a given element have identical numbers of protons but differ in the number of neutrons making up their nuclei. Particularly, in crystalline solids, this difference in
The development of the concept of isotopy from the discovery of radio-thorium by Otto Hahn in 1905 to Soddy’s proposal of the term ‘isotope’ in 1913 is presented along with a brief review of the
Francis Aston and the mass spectrograph
The chemical determination of atomic weights gives the average weight for an aggregate of a large number of atoms. Although this is useful in many applications, the determination of the masses of
The atomic number revolution in chemistry: a Kuhnian analysis
This paper argues that the field of chemistry underwent a significant change of theory in the early twentieth century, when atomic number replaced atomic weight as the principle for ordering and
Discovery of Radioactivity
Technetium, the missing element
The history of the discovered technetium is reviewed within the framework of the discovery and production of artificial radioactivity in the twentieth century and a detailed account is given of the steps taken.
The Origin of Beta Rays, and the Growing Complexity of Their Spectrum: The Rutherford Era, 1911–1919
Ernest Rutherford had a life-long partiality for alpha rays. 1 In the early years of radioactivity he simply considered beta and gamma rays to be of minor interest. “I have often pointed out,” he