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Name , symbol , atomic number Tenness, Ts, 117
Element category
Group , period , block 17 , 7 , p
CAS number 54101-14-3
Atomic mass 292 and
Electron configuration [ Rn ] 5 f 14 6 d 10 7 s 2 7 p 5
1. Ionization energy 743 kJ / mol
isotope NH t 1/2 ZA ZE (M eV ) ZP
291 Ts {syn.} 10 ms α 287 Mc
292 Ts {syn.} 50 ms α 288 Mc
293 Ts {syn.} 14 ms α 11.03 289 Mc
294 Ts {syn.} 78 ms α 10.81 290 Mc
For other isotopes see list of isotopes
Hazard and safety information
GHS hazard labeling
no classification available
As far as possible and customary, SI units are used.
Unless otherwise noted, the data given apply to standard conditions .

Tenness (English Tennessine ) is an artificially produced chemical element with the element symbol Ts and the atomic number 117. In the periodic table it is in the 17th  IUPAC group and thus belongs to the halogens . It was first artificially generated in 2010 at the Dubna Nuclear Research Center near Moscow . The name is derived from the US state of Tennessee , in which the Oak Ridge National Laboratory , producer of the precursor Berkelium , is located.

History and synthesis

The Berkelium sample for the synthesis of Tenness (in solution)

Tenness was created in 2010 by bombarding Berkelium ( 249 Bk) with the element calcium ( 48 Ca). For this purpose, a 22-milligram sample of Berkelium ( 249 Bk) was produced in 2009 in the Oak Ridge National Laboratory in a 250-day irradiation . After several processing steps, it was bombarded with calcium atoms ( 48 Ca) for 150 days in the United Institute for Nuclear Research (JINR), Dubna , Russia, in the U400 cyclotron . This resulted in the first few atoms of the Tenness isotopes 293 Ts and 294 Ts. This synthesis was a culmination of the Russian-American collaboration between JINR and Lawrence Livermore National Laboratory in the synthesis of elements 113-118, which began in 1989.

The decay times are 14 ms for the lighter isotope and 78 ms for the heavier one.

Tenness-294 was also detected in 2014 at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt.


After the discovery, the element was initially given the systematic name Ununseptium (chemical symbol Uus ), a formation from the Latin unum for 'one' and the Latin septem for 'seven', corresponding to the ordinal number 117. It was also known as Eka -Astat , composed of Sanskrit एक eka for 'one' and astat , with reference to its classification in the periodic table, a place below astat.

On December 30, 2015, the discovery of the element was officially recognized by the IUPAC and the working group of the Joint Institute for Nuclear Research Dubna, Russia, the Lawrence Livermore National Laboratory, California, USA and the Oak Ridge National Laboratory, Tennessee, USA the right to Naming awarded. On June 8, 2016, the IUPAC announced that the English name Tennessine (Ts) had been proposed for the element ; the objection period ended on November 8, 2016. On November 30, 2016, the final name was published.

Since the Germans, the English suffix -ine for items is not common and the corresponding German ending -in at least for the rest of halogens outdated, it was decided by a set up by the IUPAC expert panel in April 2017 that the German name of the element 117 Tennessee loud should, with an emphasis on the first syllable.

safety instructions

There is no classification according to the CLP regulation or other regulations, because only a few atoms of this element can be produced at the same time and thus far too few for chemical or physical hazard.

Web links

Commons : Tenness  - Album with pictures, videos and audio files
Wiktionary: Tenness  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. Entry on tennessine at WebElements, https://www.webelements.com , accessed on June 13, 2020.
  2. The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this element has either not yet been classified or a reliable and citable source has not yet been found.
  3. a b Karin J. Schmitz: Expert panel suggests German names for new elements. Message from the Society of German Chemists . April 28, 2017. Retrieved August 14, 2018 .
  4. Jan Dönges: The four new ones have a name. In: Spektrum.de . June 9, 2016, accessed August 14, 2018 .
  5. Lauren Schenkman: Finally, Element 117 Is Here! In: sciencemag.org . April 7, 2010, accessed August 14, 2018 .
  6. Christoph Seidler: Ordinal number 117: Physicists create a new chemical element. In: SPIEGEL ONLINE . April 7, 2010, accessed August 14, 2018 .
  7. ^ Nuclear missing link created at last: Superheavy element 117. Based on communications from DOE / Lawrence Livermore National Laboratory. In: ScienceDaily. April 7, 2010, accessed August 14, 2018 .
  8. Katie Walter: Collaboration Expands the Periodic Table, one element at a Time . In: Science & Technology Review . October / November 2010. Lawrence Livermore National Laboratory, 2010, pp. 16-19 (English, str.llnl.gov ).
  9. Yuri Ts. Oganessian , F. Sh. Abdullin, PD Bailey, DE Benker, ME Bennett, SN Dmitriev, JG Ezold, JH Hamilton, RA Henderson, MG Itkis , Yu. V. Lobanov, AN Mezentsev, KJ Moody, SL Nelson, AN Polyakov, CE Porter, AV Ramayya, FD Riley, JB Roberto, MA Ryabinin, KP Rykaczewski, RN Sagaidak, DA Shaughnessy, IV Shirokovsky, MA Stoyer, VG Subbotin, R Sudowe, AM Sukhov, Yu. S. Tsyganov, VK Utyonkov, AA Voinov, GK Vostokin, PA Wilk: Synthesis of a New Element with Atomic Number Z = 117 . In: Physical Review Letters . tape 104 , no. April 14 , 2010, p. 142502 , doi : 10.1103 / PhysRevLett.104.142502 (English, freely available online through physics.aps.org [PDF; 429 kB ]).
  10. J. Khuyagbaatar, A. Yakushev et al .: 48 Ca + 249 Bk Fusion Reaction Leading to Element Z = 117: Long-Lived a-Decaying 270 Db and Discovery of 266 Lr . In: Physical Review Letters . tape 112 , no. May 17 , 2014, p. 172501 , doi : 10.1103 / PhysRevLett.112.172501 (English, electronic reprint in Jyväskylä University Digital Archive [PDF; 1.1 MB ]).
  11. Super heavy element 117 detected. In: gsi.de. GSI Helmholtz Center for Heavy Ion Research , May 2, 2014, accessed on August 14, 2018 .
  12. ^ Discovery and Assignment of Elements with Atomic Numbers 113, 115, 117 and 118. In: IUPAC | International Union of Pure and Applied Chemistry . December 30, 2015, accessed August 14, 2018 .
  13. IUPAC is naming the four new elements nihonium, Moscovian, antenna sine, and oganesson. In: IUPAC | International Union of Pure and Applied Chemistry . June 8, 2016, accessed August 14, 2018 .
  14. ^ IUPAC Announces the Names of the Elements 113, 115, 117, and 118. In: IUPAC | International Union of Pure and Applied Chemistry . November 30, 2016, accessed August 14, 2018 .
  15. ^ Karl-Heinz Hellwich, Hans-Georg Weinig: German nomenclature of the new elements . In: News from chemistry . tape 65 , no. 6 , June 2017, p. 738–739 , doi : 10.1002 / nadc.20174064443 ( freely available online through goech.at [PDF; 33 kB ]).