117
Ts
Tennessine
294
Tennessine (Ts)
HalogenGroup 17Period 7p-block-blockRadioactive
Tennessine 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.
Latin name: Tennessine
Atomic Number
117
Atomic Mass
294 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ (predicted)
General
SymbolTs
Atomic Number117
Atomic Mass294 g/mol
CategoryHalogen
Group17
Period7
Blockp-block
Electron Configuration[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ (predicted)
Valence Electrons17
Colourunknown (predicted)
Physical Properties
Phase (STP)Solid (predicted)
Densitypredicted ~7 g/cm3
Melting Pointpredicted ~500 K
Boiling Pointpredicted ~1000 K
Atomic Properties
Oxidation States-1, +1, +3, +5
Ion ChargeTs-/Ts+/Ts3+/Ts5+
Nuclear & Hazards
RadioactiveYes
Half-life19 milliseconds (Ts-294)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year2010
Discovered ByJoint Institute for Nuclear Research (Dubna) and Lawrence Livermore National Laboratory
Country of DiscoveryRussia/USA
Isotopes of Tennessine
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Ts-293 | — | ~22 milliseconds | α |
| Ts-294 | — | ~51 milliseconds | α |