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General Info
Atomic Symbol Atomic symbol::Uus
Atomic Number Atomic number::117
Atomic Weight Atomic weight::294 g/mol
Chemical series Halogen
Appearance  ?
Unknown Image for Meitnerium.png
Group, Period, Block 17, 7, P
Electron configuration [Rn].5f14.6d10.7s2.7p5
Electrons per shell 2,8,18,32,32,18,7
Electron shell ununseptium.png
CAS number CAS number::87658-56-8
Physical properties
Phase Expected to be a Solid
Density Density::Unknown g/ml
Melting point Melting point::Unknown
Boiling point Boiling point::Unknown
Isotopes of Ununseptium
iso NA half-life DT DE (MeV) DP
293Uus is stable with neutrons.
294Uus 78 (+370, -36) ms
All properties are for STP unless otherwise stated.

Ununseptium is a chemical element known by the atomic symbol Uus. Its name, Ununseptium, simply stands for 117, which is the atomic number of the element. the atomic symbol for this element is Us. It is not a well researched element because of it's radioactivity and due to the fact that it is synthetic, which means it cannot be found in nature or researched naturally. A lot of information is still not known about Ununseptium because it can be only seen for about 80 milliseconds. It was discovered in 2009 and has no solid proof of its existence that is why it has no name, only a place holder. It is a radioactive element so it is dangerous to get to close to it if it could be in large quantities.


Not much is known about the element Ununseptium. It is a radioactive element and can be harmful, with a half life of about 78-88 milliseconds. As a result of its position in Group 17 of the periodic table, ununseptium is expected to have chemical properties characteristic of the halogen group. The effects of relativistic electrons, however, may result in partial metalloid properties. Too little of the element has been synthesized for its chemical properties to be confirmed.[1]


a picture of a cyclotron accelerator in Canada which may be similar to the one in Dubna Russia

In 2009, the first atoms of element 117 were made in the Flerov Laboratory of Nuclear Reactions in Dubna, Russia. The evidence was published in 2010 by the Russian and Americans that had discovered it. The discoverer of this new element was lead by Yuri Oganessian, who was joined by The Institute of Nuclear Research (Dubna, Russia); the Research Institute for Advanced Reactors, Dimitrovgrad; Lawrence Livermore National Laboratory; Oak Ridge National Laboratory; Vanderbilt University, Tennessee; and the University of Nevada, Las Vegas. IUPAC still has not confirmed its place on the periodic table.[2]

Ununseptium was made by the fusion reaction of the elements Calcium(48) and Berkelium(249). Calcium was formed into a beam and shot at the element Berkelium on a 300nm thick titanium foil. The first bombardment lasted 70 days. The berkelium was bombarded with over 7 trillion calcium-48 ions per second, accelerated to about 10% of the speed of light. The Ununseptium-293 (approximate half-life 14 ms) decayed by alpha emission into element 115 (Ununpentium). In a second bombardment they decreased the speed of the accelerator which resulted in a heavier atom that had a half life of 78 milliseconds.[3]


The name Ununseptium is not the official name for the element, it is only a place holder until more solid evidence is found on the element. “We’ve never discussed names because it’s sort of like bad karma,” Dr. Shaughnessy said. “It’s like talking about a no hitter during the no hitter. We’ve never spoken of it aloud.” Some scientists are very superstitious about naming elements before they have solid facts behind them for support.[4](publication) </ref>


a picture of an atom being held by a hand

There are no known uses if this element. It is purely for experimental uses. It has yet to be "officially" discovered. [5]




  1. Authorlastname unknown. Ununseptium Publishing-site-name. Web. 10 Oct. 2012 (publication)
  2. Authorlastname unknown. Ununseptium Publishing-site-name. Web. 10 Oct. 2012 (publication)
  3. Authorlastname unknown. Ununseptium Publishing-site-name. Web. 10 Oct. 2012
  4. Robert Quigley. Ununseptium: New Element 117 Discovered, Better Name to Come geekosystem. Web. Tuesday, April 6th 2010(creation).
  5. Authorlastname unknown. Ununseptium Publishing-site-name. Web. 10 Oct. 2012 (publication)