News | Published:

Element 93: A Correction

Nature volume 134, page 282 (25 August 1934) | Download Citation



X-RAY spectroscopic analysis has failed to confirm the presence of any new element in pitchblende from Joachimsthal. Dr. O. Koblic has consequently with drawn his claim to the discovery of an element of atomic number 93 in this uranium ore, concerning which an announcement was made in NATURE of July 14, p. 55. He now states that the substances he supposed to be the silver and thallium salts of an acid, H(93)O4, were sent to Prof. V. DolejSek (Prague) and to Drs. I. and W. Noddack (Berlin) for X-ray spectrum examination. No lines corresponding to an element of atomic number were obtained but the presence of tungsten was unmistakable. Tungsten was also detected afterwards by chemical means in Dr. Koblic's preparations. The erroneous atomic weight determination arose from the assumption that his silver salt was Ag(93)O4 whereas it was actually silver tungstate. The unusual behaviour of tungstates in acid media is suggested as an explana tion of the reactions described by Dr. Koblic (Chemicky Obzor, 9, 129; 1934) which he attributed to the presence of a new element. This with drawal has, of course, no reference to the earlier work of Prof. E. Fermi dealing with the ‘synthesi's of an element of higher atomic number than uranium (NATURE, June 16, p. 898).

About this article

Publication history





    By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

    Newsletter Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing