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What is Tennessine

Tennessine (pronounced as TEN-ess-een [2]), represented by the chemical symbol Ts, is a synthetic, radioactive element [1] belonging to the family of halogens [9]. Of its 2 known isotopes, Ts 292 and Ts 294 [1], the latter is more stable with a half-life of approximately 80 milliseconds [2]. It alpha decays into moscovium-290 [2].

Where Is It Found

The alkali metal does not occur naturally on earth [3]. Only a small amount has been synthesized in laboratories [1].



Origin of Its Name: It is named after Tennesse, a US state [1].

Who Discovered It: Scientists from the Joint Institute of Nuclear Research (JINR) in Dubna, Russia, the Lawrence Livermore National Laboratory (LLNL) in California, USA, and the Oak Ridge National Laboratory (ORNL) in Tennesse, USA [1].

How Was Tennessine Discovered

In 2015, IUPAC confirmed the discovery of the element by a collaboration of scientists from JINR, LLNL and ORNL [1]. They had produced it on April 5, 2010, by bombarding berkelium 249 atoms with calcium 48 ions [2].

Tennessine Identification

Atomic Number  117 [1]
CAS Number  87658-56-8 [1]
Position in the periodic table Group Period Block
  17 [1] 7 [1] p [1]

Properties and Characteristics of Tennessine

General Properties

Atomic mass 294 atomic mass units [1]
Atomic weight 294 [1]

Physical Properties

Color/appearance Unknown [3]
Melting point/freezing point Unknown [1]
Boiling point Unknown [1]
Density Unknown [1]
State of matter at room temperature (normal phase) Solid [1]
Thermal conductivity N/A [8]

Chemical Properties

Oxidation states Unknown [1]
Reactivity Unknown [5]

Atomic Data of Tennessine (Element 117)

Valence electrons 7s27p5 [6] (predicted depending on its position in periodic table)
Electron configuration (noble gas configuration) [Rn] 5f146d107s27p5 [1]
Atomic structure
– Number of Electrons 117 [3]
– Number of Neutrons 177 [3]
– Number of Protons 117 [3]
Energy levels [3]
– First Energy Level 2
– Second Energy Level 8
– Third Energy Level 18
– Fourth Energy Level 32
– Fifth Energy Level 32
– Sixth Energy Level 18
– Seventh Energy Level 7
Radius of atom
– Atomic Radius Unknown [1]
– Covalent Radius 1.65 Å [1]
Electronegativity N/A [8]
Ionization energy

(kJmol-1) [1]

1st 2nd 3rd 4th 5th 6th 7th

Tennessine Electron Configuration (Bohr Model)

Tennessine Uses

Due to its miniscule production, its use is restricted to research purposes [1].

Is It Dangerous

Being highly radioactive, it can cause harm if present in significant amounts [1, 3].

Interesting Facts

  • IUPAC named Ts along with the elements oganesson (Og), moscovium (Mc) and nihonium (Nh) on 28th November 2016 [4].
  • It had been given a placeholder name ununseptium (with symbol uus), representing its atomic number, before being officially named by IUPAC.

Tennessine (Ununseptium) Cost

Unknown, as a tiny amount of it is available till date [3].



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