Isotopes and Atomic Weights

@article{Aston1920IsotopesAA,
  title={Isotopes and Atomic Weights},
  author={Francis William Aston},
  journal={Nature},
  year={1920},
  volume={105},
  pages={617-619}
}
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… 

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