Abstract
ALMOST five years ago, in a lecture to the Institute of Chemistry in London, the success that radioactive methods had achieved in the task of completing the Periodic System was described1. In the table given, the place of element 87 was filled by the symbol of a newly discovered branch product in the actinium series ; but in the places of elements 43, 61, 85 and 93 no symbols were inserted, although, as explained in some detail, atoms of all these four elements had been artificially produced.
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References
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PANETH, F. THE MAKING OF THE MISSING CHEMICAL ELEMENTS*. Nature 159, 8–10 (1947). https://doi.org/10.1038/159008a0
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DOI: https://doi.org/10.1038/159008a0
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