Tennessine is a superheavy element with atomic number 117, the second-heaviest known, and it has no stable isotopes. It was first produced by a Russian and American collaboration, in which scientists at Dubna bombarded a target of berkelium, supplied by Oak Ridge National Laboratory in Tennessee, with calcium-48 ions. Experiments in 2009 and 2010 yielded a few atoms that decayed within milliseconds, and later work confirmed the result. The element belongs to the halogen group of the periodic table, although its chemistry is expected to differ from that of lighter members such as chlorine. Its name, adopted in 2016, honours the US state of Tennessee and its contribution to the research.
Before and after
- from 29 November 2008 to 19 December 2015Premiere of The Penguins of Madagascar
- 4 December 2008Publication of The Tales of Beedle the Bard
- from 27 December 2008 to 18 January 2009Gaza War (2008–2009)
- 2009Discovery of Staffordshire Hoard
- 2009Discovery of tennessine
- 2009Rise of effective altruism
- 2009Premiere of As Aventuras de Gui & Estopa
- 2009Establishment of Band-e Amir National Park
- 2 January 2009Discovery of HAT-P-11 b
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