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| General properties | ||||||||||||||||
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| Pronunciation | /ˈɛnɪsiːn/ | |||||||||||||||
| Appearance | semimetallic (predicted) | |||||||||||||||
| Mass number | 294 (most stable isotope) | |||||||||||||||
| Tennessine in the periodic table | ||||||||||||||||
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| Atomic number (Z) | 117 | |||||||||||||||
| Group | group 17 | |||||||||||||||
| Period | period 7 | |||||||||||||||
| Block | p-block | |||||||||||||||
| Element category | unknown chemical properties, but probably a post-transition metal | |||||||||||||||
| Electron configuration | [Rn] 5f14 6d10 7s2 7p5 (predicted) | |||||||||||||||
Electrons per shell | 2, 8, 18, 32, 32, 18, 7 (predicted) | |||||||||||||||
| Physical properties | ||||||||||||||||
| Phase at STP | Ts: Unknown phase (predicted) | |||||||||||||||
| Melting point | 623–823 K (350–550 °C, 662–1022 °F) (predicted) | |||||||||||||||
| Boiling point | 883 K (610 °C, 1130 °F) (predicted) | |||||||||||||||
| Density (near r.t.) | 7.1–7.3 g/cm3 (extrapolated) | |||||||||||||||
| Atomic properties | ||||||||||||||||
| Oxidation states | (−1), (+1), (+3), (+5) (predicted) | |||||||||||||||
| Ionization energies |
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| Atomic radius | empirical: 138 pm (predicted) | |||||||||||||||
| Covalent radius | 156–157 pm (extrapolated) | |||||||||||||||
| Other properties | ||||||||||||||||
| Natural occurrence | Ts: Synthetic | |||||||||||||||
| CAS Number | 54101-14-3 | |||||||||||||||
| History | ||||||||||||||||
| Naming | after Tennessee region | |||||||||||||||
| Discovery | Joint Institute for Nuclear Research, Lawrence Livermore National Laboratory, Vanderbilt University and Oak Ridge National Laboratory (2009) | |||||||||||||||
| Main isotopes of tennessine | ||||||||||||||||
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Tennessine (formerly Ununseptium meaning "one-one-seven-ium" in Latin) is a radioactive superheavy man-made chemical element. It has a symbol Ts and atomic number of 117. It is the second heaviest element of all, and is the second to last element. It is in group 17 in the periodic table, where the halogens are. Its properties are not yet fully known but it is probably a metalloid. The discovery of tennessine was announced in 2010 by scientists in Russia and the United States. They collaborated and it is the most recently discovered element as of 2019. It is named after the state of Tennessee and it has no uses except research.
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