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 | |||||||||||
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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 | ||||||||||
Atomic properties | |||||||||||
Electronegativity (Pauling Scale) | |||||||||||
Electron affinity | 165.9 kJ/mol | ||||||||||
Oxidation states | (−1), (+1), (+3), (+5) (predicted) | ||||||||||
Ionization energies |
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Electron configuration | |||||||||||
Elektronkonfiguration (shorthand) | [Rn] 5f14 6d10 7s2 7p5 | ||||||||||
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 |