Tennessine
| Atomic Number: | 117 | Atomic Radius: | -- |
| Atomic Symbol: | Ts | Melting Point: | -- |
| Atomic Weight: | 294 | Boiling Point: | -- |
| Electron Configuration: | -- | Oxidation States: | -- |
History
Tennessine is a superheavy artificial chemical element with an atomic number of 117. Also known as eka-astatine or element 117, it is the second-heaviest known element and penultimate element of the 7th period of the periodic table. As of 2016, fifteen atoms have been observed: six when it was first synthesized in 2010, seven in 2012, and two in 2014.
The discovery of Tennessine was announced in Dubna, Russia, by a Russian–American collaboration in 2010, which makes it the most recently discovered element as of 2016. One of its daughter isotopes was created directly in 2011, partially confirming the results of the experiment. The experiment itself was repeated successfully by the same collaboration in 2012 and by a joint German–American team in 2014. In 2015, the Joint Working Party of theInternational Union of Pure and Applied Chemistry and the International Union of Pure and Applied Physics, which evaluates claims of discovery of new elements, has recognized the element and assigned the priority to the Russian–American team. In June 2016, the IUPAC published a declaration stating that the discoverers suggested a name of Tennessine (/ˈtɛnᵻsaɪn/ or /ˈtɛnᵻsiːn/), symbol Ts, named after Tennessee, United States.[a] The name is set to be formally accepted in or after November 2016.
Tennessine may be located in the "island of stability", a concept that explains why some superheavy elements are more stable compared to an overall trend of decreasing stability for elements beyond lead on the periodic table. The synthesized atoms have lasted tens and hundreds of milliseconds. In the periodic table, it is expected to be a member of group 17, all other members of which are halogens.[b] Some of its properties are likely to be significantly different from those of the halogens due to relativistic effects. Unlike the halogens, it is likely to neither commonly form anions nor achieve high oxidation states. A few key properties, such as its melting and boiling points and its first ionization energy, are nevertheless expected to follow the periodic trends of the halogens.
https://en.wikipedia.org/wiki/Ununseptium