Ununseptium is an artificially created element found in the periodic table and the chemical name of this element is Tennessine symbolised as Ts. It was first invented in the year of 2010 in a Russian laboratory. In the periodic table, it is placed in the group of p-block elements and group number is 7. Therefore, it is classified as a halogen. Ununseptium is solid at room temperature. It has four isotopes such as: $\mathrm{^{291}Ts,\: ^{292}Ts,\:^{293}Ts,}$ and $\mathrm{^{294}Ts}$.

What is Ununseptium?

Ununseptium is a recently discovered component that is placed in 117 in the periodic table. It is the decay product of 118 components. It is not a permanent name and taken from the Latin language that means one-one-seven. Ununseptium is an artificially made super heavy element and is not found freely on earth. Ununseptium is officially familiar as Tennessine.

Figure 1: Structure of Ununseptium

Pumbaa (original work by Greg Robson), Electron shell 117 Ununseptium, CC BY-SA 2.0 UK

It is produced when 22mg of berkelium-249 are attacked with calcium-48 atoms. These product atoms are known to have two distinct atomic weighs of 293 and 294. The International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP) has acknowledged the discovery of this component.

Ununseptium: Discovery

Ununseptium was first invented on 5th April 2010 by the research scientists at the Joint Institute for Nuclear Research in Dubna, Russia along with the U.S. Department of Energy's Lawrence Livermore National Laboratory, and Oak Ridge National Laboratory. Scientists bombarded berkelium ions with calcium.

Ununsepium or Uus is named temporarily till it has not been given an official name by The International Union of Pure and Applied Chemistry (IUPAC) on 28th November, 2016. Its position in the periodic table classifies this component as a halogen. Relativistic effect of electrons may cause partial metalloid properties. A very small amount of the component has been synthesised to confirm the chemical properties.

Ununseptium: Atomic Data

Atomic data of Ununseptium are given as follows −

  • Name of Element: The official name of Unuunseptium is Tennessine.

  • Symbol of Element: The symbol of the element is Ts.

  • InChI: The InChI of this element is 1S/Ts.

  • Period: This component comes under period 17 of the periodic table.

  • Block: Ununseptium falls under the p-block element series.

  • Atomic number: The atomic number of Ununseptium is 117.

  • Electron numbers: The number of the electrons is 117.

  • Protons number: The number of protons is 117.

  • Neutrons number: The number of neutrons is 117.

  • Atomic mass: The atomic mass of Ununseptium is 294 amu.

  • Atomic weight: The atomic weight of this component is 294.

  • Melting point: The melting point of this element is predicted as 623–823K.

  • Boiling point: Boiling point of Ununseptium is 883K.

  • CAS number: The CAS number of this element is 87658-56-8.

  • InChIKey: The InChIKey of this element is INMSAURDCVBGHH-UHFFFAOYSA-N.

  • Covalent radius (Å): Covalent radius of this element is 1.65 Å.

  • Atomic radius: The atomic radius of this component is yet to be discovered.

Ununseptium: Properties

Ununseptium is a very new element therefore, many properties are still undiscovered. Some of the properties of Ununsepitum are as follows −

  • Atomic weight: The atomic weight of this component is 294.

  • Relative mass: Relative Mass of Ununseptium is 292.20746 g/mol.

  • Configuration of electron: The configuration of electron is predicted as $\mathrm{[Rn]\:7s^2\:7p^5\:5f^{14}\:6d^{10}}$.

  • The radius of the atom: It is predicted that the empirical atomic radius is 138 pm.

  • Oxidation state: The oxidation states of this element are predicted as −1, +1, +3, +5.

  • Physical appearance: This component is generally expected to exist in a solid state.

  • Element Group Number: This element falls under the 17th group that is the group for halogens.

  • Valence Electron: The valence electron of this component is $\mathrm{7s^{2}7p^5}$. It is predicted depending on its place in the periodic table.

  • Ununseptium is a very highly radioactive metal.

Ununseptium: Sources and Uses


Ununseptium is an artificially made component and cannot be found on the planet. This was made in the laboratory when berkelium-249 ion was attacked by calcium-48.


This element is recently discovered and still few Ununseptium atoms have been ever made. Currently, it has no utilisation except for basic scientific research. It is a very high radioactive material. A small quantity of this element can be dangerous.


Normally, Ununseptium is does not exist freely on earth’s crust. The name Tennessine is in remembrance of the allowance of the Tennessee region including Oak Ridge National Laboratory (ORNL), Vanderbilt University and the University of Tennessee at Knoxville, for researching super-heavy element including the manufacture and separation of chemical of unique actinide target component for the synthesis of super-heavy element at ORNL’s High Flux Isotope Reactor (HFIR) and Radiochemical Engineering Development Centre (REDC). On November 28th, 2016 IUPAC named Tennessine along with other components such as oganesson (Og), moscovium (Mc) and nihonium (Nh).


Q1. What is a periodic table?

Ans. The periodic table is an arrangement of chemical components in a tabular form where the components are placed according to their atomic number, electronic configuration and recurring chemical properties. Normally elements on the left side of the periodic table are metal in nature and on the right side are non-metal.

Q2. What are halogens?

Ans. Halogens refers to a family of chemical components that are occupied a total column of the periodic table. Most normally found halogen components are fluorine, chlorine, bromine and iodine. They are placed in group number 17 and these are non-metals in nature. The term halogen is taken from Greek language that means salt-producing because halogens produce salt after a reaction with metals.

Q3. What are the uses of halogens?

Ans. There are several uses of halogens such as: bromine and chlorine are utilised as disinfectants for pools, water purification, dishes and surface sterilisation; iodine and bromine are present in halogen lamps in a very little quantity; fluoride are present in baby formulas, vitamin supplements and toothpaste; fluoride anions are seen in several organisms in small quantity.

Updated on: 17-Apr-2023


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