Which chemical element has the symbol Uno?


Name, symbol, atomic number Hassium, Hs, 108
seriesTransition metals
Group, period, block8, 7, d
CAS number 54037-57-9
Atomic mass 265, 269, 270 and the like
Electron configuration [Rn] 5f14 6d6 7s2 (?)
For other isotopes, see the list of isotopes safety instructions further safety information radioactivity

Radioactive elementAs far as possible and customary, SI units are used.
Unless otherwise noted, the data given apply to standard conditions.

Hassium ("Eka-Osmium") is an exclusively artificially produced chemical element with the element symbol Hs and the atomic number 108. It is one of the transactinoids (7th period, d-block).


Hassium was first produced on March 14, 1984 at the Society for Heavy Ion Research (GSI) in Darmstadt by fusing lead with iron.[2] It was initially called Unniloctium (symbol Uno). The 1994 IUPAC recommendation (see element naming controversy) for the name was Hahnium (after Otto Hahn).[3] Since 1997 it bears its current name, which is different from the Latin name Hassia for the state of Hesse.[4]


Hassium, like most transactinoids, is very short-lived. 265Hs has a half-life of 1.5 ms and 269Hs 10 s.[5]277With a half-life of 16.5 minutes, Hs is the longest-lived isotope.[6][7]


In 2001 an oxygen compound of the hassium could be generated at the GSI in Darmstadt.[5][8] Because of its high volatility, it is most likely hassium tetroxide 269HsO4, the analogue of the homologous osmium tetroxide. Despite the short half-life, the researchers were able to guide an average of two to three molecules per day to a thermochromatograph. Surprisingly, HsO4 a higher deposition temperature on the detector surfaces and thus a lower volatility than OsO4.[5]

safety instructions

Classifications according to the Hazardous Substances Ordinance are not available because they only include chemical hazard and play a completely subordinate role compared to the hazards based on radioactivity. The latter also only applies if the amount of substance involved is relevant.

Individual evidence

  1. ↑ This element has either not yet been classified with regard to its dangerousness or a reliable and citable source has not yet been found.
  2. ↑ G. Munzenberg, P. Armbruster, H. Folger, P. F. Heßberger, S. Hofmann, J. Keller, K. Poppensieker, W. Reisdorf, K.-H. Schmidt, H.-J. Schött, M. E. Leino, R. Hingmann: The identification of element 108, in: Journal of Physics A Hadrons and Nuclei, 1984, 317 (2), Pp. 235-236; doi: 10.1007 / BF01421260.
  3. ^ Names and Symbols of Transfermium Elements (IUPAC Recommendations 1994).
  4. ^ Names and Symbols of Transfermium Elements (IUPAC Recommendations 1997).
  5. 5,05,15,2Ch. E. Düllmann, W. Brüchle, R. Dressler, K. Eberhardt, B. Eichler, R. Eichler, HW Gäggeler, TN Ginter, F. Glaus, KE Gregorich, DC Hoffman, E. Jäger, DT Jost, UW Kirbach, DM Lee, H. Nitsche, JB Patin, V. Pershina, D. Piguet, Z. Qin, M. Skull, B. Schausten, E. Schimpf, H.-J. Schött, S. Soverna, R. Sudowe, P. Thörle, S. N. Timokhin, N. Trautmann, A. Türler, A. Vahle, G. Wirth, A. B. Yakushev & P. ​​M. Zielinski: Chemical investigation of potassium (element 108); in: Nature, 2002, 418, Pp. 859-862; doi: 10.1038 / nature00980.
  6. ↑ J. Dvorak, W. Brüchle, M. Chelnokov, R. Dressler, Ch. E. Düllmann, K. Eberhardt, V. Gorshkov, E. Jäger, R. Krücken, A. Kuznetsov, Y. Nagame, F. Nebel, Z. Novackova, Z. Qin, M. Skull, B. Schausten, E. Schimpf, A. Semchenkov, P. Thörle, A. Türler, M. Wegrzecki, B. Wierczinski, A. Yakushev, and A. Yeremin: Doubly Magic Nucleus 108270Hs162, in: Phys. Rev. Lett., 2006, 97 (24), 242501 (4 pages); doi: 10.1103 / PhysRevLett.97.242501.
  7. ↑ Mason Inman: A Nuclear Magic Trick. In: Physical Review Focus. 18, American Physical Society, December 14, 2006 (online, accessed December 21, 2006).
  8. ↑ Matthias Skull and Andreas Türler: A place for heavyweights, in: Physics Journal, 2009, 8 (6), Pp. 35-40; Abstract.

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