Isotopes and Atomic Weights

  title={Isotopes and Atomic Weights},
  author={Francis William Aston},
IN the atomic theory put forward by John Dalton in 1801 the second postulate was: “Atoms of the same element are similar to one another and equal in weight.” For more than a century this was regarded by chemists and physicists alike as an article of scientific faith. The only item among the immense quantities of knowledge acquired during that productive period which offered the faintest suggestion against its validity was the inexplicable mixture of order and disorder among the elementary… 

Mass spectrometry and isotopes: a century of research and discussion.

The isotope problem was finally settled, but more accurate mass measurements showed that even isotopic weights differed to some extent from the whole numbers, which was the prerequisite for the discovery that isotopic ratios varied somewhat in nature.

Sub-Nucleonic Structure and the Modern Picture of Isotopes

Investigations of the atomic nucleus, and the fundamental forces that determine nuclear structure as is well known offer fascinating insights into the nature of the physical world. We all known well

Atomic weights: not so constant after all

  • W. Brand
  • Chemistry
    Analytical and Bioanalytical Chemistry
  • 2012
The IUPAC Commission on Isotopic Abundances and Atomic Weights has changed the way certain atomic weights are reported, replacing the fixed ‘standard atomic weight’ with an atomic weight ‘interval’ for ten predominantly light elements, reflecting the variability of their isotopic composition.

Chlorine Isotope Geochemistry

Chlorine played a prominent role in the discovery of isotopes. The famous Cavendish Laboratory scientists were fascinated with the atomic mass of Cl. Most elements have a mass that is a close

Whom should we credit for the discovery of isotopes?

  • G. Eaton
  • Education
    Foundations of Chemistry
  • 2019
Whom should we credit for the discovery of isotopes? The first suggestion of an idea, the first experimental proof, or the development of a new method that clearly reveals the isotopes? Strömholm and

A Short History of Early Work on Isotopes

A brief introduction deals with the time period from Dalton to the discovery of isotopes by Soddy and Fajans in the early twentieth century which was soon followed by the invention of the mass