| From Wikipedia, the free encyclopediaTennessine is a superheavy artificial chemical element with an atomic number of 117 and a symbol of Ts. 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 tennessine atoms have been observed:six when it was first synthesized in 2010, seven in 2012, and two in 2014. | |||
Tennessine in the periodic table | |||
|---|---|---|---|
| Symbol | Ts | ||
| Atomic number | 117 | ||
| Group | 17 | ||
| Period | 7 | ||
| Block | p | ||
| Element category | Unknown | ||
Physical properties | |||
| Phase at STP | Solid | ||
| Density | 7.17 g/cm3 | ||
| Atomic weight | 294 u | ||
| Melting point | 723 K 449.85 °C 841.73 °F | ||
| Boiling point | 883 K 609.85 °C 1129.73 °F | ||
Atomära egenskaper | |||
| Electronegativity (Pauling Scale) | |||
| Electron affinity | 165.9 kJ/mol | ||
| Ionization energies |
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Electron configuration | |||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p5 | ||
| Electrons per shell | 2, 8, 18, 32, 32, 18, 7 | ||
History | |||
| Discovered | 2009 | ||
| Discovered by | Joint Institute for Nuclear Research | ||