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Tennessine (Ts)

Tennessine is a chemical element of the periodic table with chemical symbol Ts and atomic number 117 with an atomic weight of 294 u and is classed as unknown and is part of group 17 (fluorine group). Tennessine is solid at room temperature.

Tennessine in the periodic table

Atomic number117
Group17 (Fluorine group)
Number of protons117 p+
Number of neutrons177 n0
Number of electrons117 e-
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.

Physical properties

Phase at STPSolid
Density7.17 g/cm3
Atomic weight294 u

Thermal properties

Melting point723 K
449.85 °C
841.73 °F
Boiling point883 K
609.85 °C
1129.73 °F
Heat of vaporization-

Atomic properties

Electronegativity (Pauling Scale)-
Electron affinity165.9 kJ/mol
Oxidation states(−1), (+1), (+3), (+5)
Ionization energies
  1. 736.9 kJ/mol
  2. 1435.4 kJ/mol
  3. 2161.9 kJ/mol
  4. 4012.9 kJ/mol
  5. 5076.4 kJ/mol

Electron configuration for tennessine

Electron configuration
Shorthand configuration
[Rn] 5f14 6d10 7s2 7p5
Electron configuration
Full configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p5
Electron configuration chart
Electrons per shell2, 8, 18, 32, 32, 18, 7
Valence electrons
Valency electrons
Bohr model
TennessineElectron shell for Tennessine, created by Injosoft ABTs
Figure: Shell diagram of Tennessine (Ts) atom.
Orbital Diagram

The history of Tennessine

DiscoveryJoint Institute for Nuclear Research, LLNL, Vandy, ORNL (2009)
Discovery of tennessine
The discovery of tennessine was officially announced in Dubna, Russia, by a Russian–American collaboration in April 2010, which makes it the most recently discovered element as of 2022. One of its daughter isotopes was created directly in 2011, partially confirming the results of the experiment. The experiment itself was repeated successfully by the same collaboration in 2012 and by a joint German–American team in May 2014. In December 2015, the Joint Working Party of the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP), which evaluates claims of discovery of new elements, recognized the element and assigned the priority to the Russian–American team. In June 2016, the IUPAC published a declaration stating that the discoverers had suggested the name tennessine after Tennessee, United States, a name which was officially adopted in November 2016.


List of unique identifiers for Tennessine in various chemical registry databases
CAS Number87658-56-8
ChemSpider ID-
EC number-
PubChem CID Number-