Oganesson - wikipedia Oganesson chemical element with atomic number 118 Oganesson, Og General properties Pronunciation / ˌoʊɡəˈnɛsɒn / ( OH - gə - NES - on ) / ˌɒɡəˈnɛsɒn / ( OG - ə - NES - on ) Mass number 294 ( most stable isotope ) ( unconfirmed : 295 ) Oganesson in the periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury ( element ) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Rn ↑ Og ↓ ( Usb ) tennessine ← oganesson → ununennium Atomic number ( Z ) 118 Group group 18 Period period 7 Element category unknown chemical properties, but probably a noble gas Block p - block Electron configuration ( Rn ) 5f 6d 7s 7p ( predicted ) Electrons per shell 2, 8, 18, 32, 32, 18, 8 ( predicted ) Physical properties Phase at STP solid ( predicted ) Boiling point 350 ± 30 K ​ ( 80 ± 30 ° C, ​ 170 ± 50 ° F ) ( extrapolated ) Density when liquid ( at m.p. ) 4.9 -- 5.1 g / cm ( predicted ) Critical point 439 K, 6.8 MPa ( extrapolated ) Heat of fusion 23.5 kJ / mol ( extrapolated ) Heat of vaporization 19.4 kJ / mol ( extrapolated ) Atomic properties Oxidation states − 1, 0, + 1, + 2, + 4, + 6 ​ ( predicted ) Ionization energies 1st : 860.1 kJ / mol ( predicted ) 2nd : 1560 kJ / mol ( predicted ) Covalent radius 157 pm ( predicted ) Miscellanea Crystal structure ​ face - centered cubic ( fcc ) ( extrapolated ) CAS Number 54144 - 19 - 3 History Naming after Yuri Oganessian Prediction Niels Bohr ( 1922 ) Discovery Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory ( 2002 ) Main isotopes of oganesson Isotope Abundance Half - life ( t ) Decay mode Product Og syn 181 ms ? α Lv Og syn 0.69 ms α Lv SF view talk references in Wikidata Oganesson is a synthetic chemical element with symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research ( JINR ) in Dubna, Russia by a joint team of Russian and American scientists. In December 2015, it was recognized as one of four new elements by the Joint Working Party of the international scientific bodies IUPAC and IUPAP. It was formally named on 28 November 2016. The name is in line with the tradition of honoring a scientist, in this case the nuclear physicist Yuri Oganessian, who has played a leading role in the discovery of the heaviest elements in the periodic table. It is one of only two elements named after a living person at the time of naming, the other being seaborgium. Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five ( possibly six ) atoms of the nuclide Og have been detected. Although this allowed very little experimental characterization of its properties and possible compounds, theoretical calculations have resulted in many predictions, including some surprising ones. For example, although oganesson is a member of group 18 -- the first synthetic element to be so -- it may be significantly reactive, unlike all the other elements of that group ( the noble gases ). It was formerly thought to be a gas under normal conditions but is now predicted to be a solid due to relativistic effects. On the periodic table of the elements it is a p - block element and the last one of the 7th period. Contents 1 History 1.1 Early speculation 1.2 Unconfirmed discovery claims 1.3 Discovery reports 1.4 Confirmation 1.5 Naming 2 Characteristics 2.1 Nuclear stability and isotopes 2.2 Calculated atomic and physical properties 2.3 Predicted compounds 3 See also 4 References 5 Further reading 6 External links History See also : Timeline of chemical element discoveries Early speculation The Danish physicist Niels Bohr was the first to seriously consider the possibility of an element with an atomic number as high as 118, noting in 1922 that such an element would take its place in the periodic table below radon as the seventh noble gas. Following this, Aristid von Grosse wrote an article in 1965 predicting the likely properties of element 118. These were remarkably early predictions, given that it was not yet known how to produce elements artificially in 1922, and that the existence of the island of stability had not yet been theorized in 1965. It was 80 years from Bohr 's prediction before oganesson was successfully synthesised, although its chemical properties have not been investigated to determine if it behaves as the heavier congener of radon. Unconfirmed discovery claims In late 1998, Polish physicist Robert Smolańczuk published calculations on the fusion of atomic nuclei towards the synthesis of superheavy atoms, including oganesson. His calculations suggested that it might be possible to make oganesson by fusing lead with krypton under carefully controlled conditions, and that the fusion probability ( cross-section ) of that reaction would be close to the lead -- chromium reaction that had produced element 106, seaborgium. This contradicted predictions that the cross-sections for reactions with lead or bismuth targets would go down exponentially as the atomic number of the resulting elements increased. In 1999, researchers at Lawrence Berkeley National Laboratory made use of these predictions and announced the discovery of livermorium and oganesson, in a paper published in Physical Review Letters, and very soon after the results were reported in Science. The researchers reported that they had performed the reaction Kr + Pb → Og + n. The following year, they published a retraction after researchers at other laboratories were unable to duplicate the results and the Berkeley lab could not duplicate them either. In June 2002, the director of the lab announced that the original claim of the discovery of these two elements had been based on data fabricated by principal author Victor Ninov. Newer experimental results and theoretical predictions have confirmed the exponential decrease in cross-sections with lead and bismuth targets as the atomic number of the resulting nuclide increases. Discovery reports The first genuine decay of atoms of oganesson was observed in 2002 at the Joint Institute for Nuclear Research ( JINR ) in Dubna, Russia, by a joint team of Russian and American scientists. Headed by Yuri Oganessian, a Russian nuclear physicist of Armenian ethnicity, the team included American scientists of the Lawrence Livermore National Laboratory, California. The discovery was not announced immediately, because the decay energy of Og matched that of Po, a common impurity produced in fusion reactions aimed at producing superheavy elements, and thus announcement was delayed until after a 2005 confirmatory experiment aimed at producing more oganesson atoms. On 9 October 2006, the researchers announced that they had indirectly detected a total of three ( possibly four ) nuclei of oganesson - 294 ( one or two in 2002 and two more in 2005 ) produced via collisions of californium - 249 atoms and calcium - 48 ions. Cf + Ca → Og + 3 n. Radioactive decay pathway of the isotope oganesson - 294. The decay energy and average half - life is given for the parent isotope and each daughter isotope. The fraction of atoms undergoing spontaneous fission ( SF ) is given in green. In 2011, IUPAC evaluated the 2006 results of the Dubna -- Livermore collaboration and concluded : `` The three events reported for the Z = 118 isotope have very good internal redundancy but with no anchor to known nuclei do not satisfy the criteria for discovery ''. Because of the very small fusion reaction probability ( the fusion cross section is ~ 0.3 -- 0.6 pb or 6959300000000000000 ♠ ( 3 -- 6 ) × 10 m ) the experiment took four months and involved a beam dose of 7019250000000000000 ♠ 2.5 × 10 calcium ions that had to be shot at the californium target to produce the first recorded event believed to be the synthesis of oganesson. Nevertheless, researchers were highly confident that the results were not a false positive, since the chance that the detections were random events was estimated to be less than one part in 7005100000000000000 ♠ 100 000. In the experiments, the alpha - decay of three atoms of oganesson was observed. A fourth decay by direct spontaneous fission was also proposed. A half - life of 0.89 ms was calculated : Og decays into Lv by alpha decay. Since there were only three nuclei, the half - life derived from observed lifetimes has a large uncertainty : 6996890000000000000 ♠ 0.89 + 1.07 − 0.31 ms. Og → Lv + He The identification of the Og nuclei was verified by separately creating the putative daughter nucleus Lv directly by means of a bombardment of Cm with Ca ions, Cm + Ca → Lv + 3 n, and checking that the Lv decay matched the decay chain of the Og nuclei. The daughter nucleus Lv is very unstable, decaying with a lifetime of 14 milliseconds into Fl, which may experience either spontaneous fission or alpha decay into Cn, which will undergo spontaneous fission. In a quantum - tunneling model, the alpha decay half - life of Og was predicted to be 6996660000000000000 ♠ 0.66 + 0.23 − 0.18 ms with the experimental Q - value published in 2004. Calculation with theoretical Q - values from the macroscopic - microscopic model of Muntian -- Hofman -- Patyk -- Sobiczewski gives somewhat lower but comparable results. Confirmation In December 2015, the Joint Working Party of international scientific bodies International Union of Pure and Applied Chemistry ( IUPAC ) and International Union of Pure and Applied Physics ( IUPAP ) recognized the element 's discovery and assigned the priority of the discovery to the Dubna -- Livermore collaboration. This was on account of two 2009 and 2010 confirmations of the properties of the granddaughter of Og, Fl, at the Lawrence Berkeley National Laboratory, as well as the observation of another consistent decay chain of Og by the Dubna group in 2012. The goal of that experiment had been the synthesis of Ts via the reaction Bk ( Ca, 3n ), but the short half - life of Bk resulted in a significant quantity of the target having decayed to Cf, resulting in the synthesis of oganesson instead of tennessine. From 1 October 2015 to 6 April 2016, the Dubna team performed a similar experiment with Ca projectiles aimed at a mixed - isotope californium target containing Cf, Cf, and Cf, with the aim of producing the heavier oganesson isotopes Og and Og. Two beam energies at 252 MeV and 258 MeV were used. Only one atom was seen at the lower beam energy, whose decay chain fitted the previously known one of Og ( terminating with spontaneous fission of Fl ), and none were seen at the higher beam energy. The experiment was then halted, as the glue from the sector frames covered the target and blocked evaporation residues from escaping to the detectors. The Dubna team planned to repeat this experiment in 2017. One atom of the isotope Og may have been seen in a 2011 experiment at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany aimed at the synthesis of element 120 in the reaction Cm+ Cr, but uncertainties in the data meant that the observed chain can not be definitely assigned to 120 and Og : the data indicates a longer half - life of Og of 181 milliseconds than that of Og, which is 0.7 milliseconds. Naming Element 118 was named after Yuri Oganessian, a pioneer in the discovery of synthetic elements, with the name oganesson ( Og ). Oganessian and the decay chain of oganesson - 294 were pictured on a stamp of Armenia issued on 28 December 2017. Using Mendeleev 's nomenclature for unnamed and undiscovered elements, oganesson is sometimes known as eka - radon ( until the 1960s as eka - emanation, emanation being the old name for radon ). In 1979, IUPAC assigned the systematic placeholder name ununoctium to the undiscovered element, with the corresponding symbol of Uuo, and recommended that it be used until after confirmed discovery of the element. Although widely used in the chemical community on all levels, from chemistry classrooms to advanced textbooks, the recommendations were mostly ignored among scientists in the field, who called it `` element 118 '', with the symbol of E118, ( 118 ), or even simply 118. Before the retraction in 2002, the researchers from Berkeley had intended to name the element ghiorsium ( Gh ), after Albert Ghiorso ( a leading member of the research team ). The Russian discoverers reported their synthesis in 2006. According to IUPAC recommendations, the discoverers of a new element have the right to suggest a name. In 2007, the head of the Russian institute stated the team were considering two names for the new element : flyorium, in honor of Georgy Flyorov, the founder of the research laboratory in Dubna ; and moskovium, in recognition of the Moscow Oblast where Dubna is located. He also stated that although the element was discovered as an American collaboration, who provided the californium target, the element should rightly be named in honor of Russia since the Flerov Laboratory of Nuclear Reactions at JINR was the only facility in the world which could achieve this result. These names were later proposed for element 114 ( flerovium ) and element 116 ( moscovium ). However, the final name proposed for element 116 was instead livermorium, and the name moscovium was later proposed and accepted for element 115 instead. Traditionally, the names of all noble gases end in `` - on '', with the exception of helium, which was not known to be a noble gas when discovered. The IUPAC guidelines valid at the moment of the discovery approval however required all new elements be named with the ending `` - ium '', even if they turned out to be halogens ( traditionally ending in `` - ine '' ) or noble gases ( traditionally ending in `` - on '' ). While the provisional name ununoctium followed this convention, a new IUPAC recommendation published in 2016 recommended using the `` - on '' ending for new group 18 elements, regardless of whether they turn out to have the chemical properties of a noble gas. Wikinews has related news : IUPAC proposes four new chemical element names In June 2016 IUPAC announced that the discoverers planned to give the element the name oganesson ( symbol : Og ), in honour of the Russian nuclear physicist Yuri Oganessian, a pioneer in superheavy element research for sixty years reaching back to the field 's foundation : his team and his proposed techniques had led directly to the synthesis of elements 106 through 118. The name became official on 28 November 2016. Oganessian later commented on the naming : For me, it is an honour. The discovery of element 118 was by scientists at the Joint Institute for Nuclear Research in Russia and at the Lawrence Livermore National Laboratory in the US, and it was my colleagues who proposed the name oganesson. My children and grandchildren have been living in the US for decades, but my daughter wrote to me to say that she did not sleep the night she heard because she was crying. -- Yuri Oganessian The naming ceremony for moscovium, tennessine, and oganesson was held on 2 March 2017 at the Russian Academy of Sciences in Moscow. Characteristics Nuclear stability and isotopes Oganesson ( row 118 ) is slightly above the `` island of stability '' ( white circle ) and thus its nuclei are slightly more stable than otherwise predicted. Main article : Isotopes of oganesson See also : Island of stability The stability of nuclei quickly decreases with the increase in atomic number after curium, element 96, whose half - life is four orders of magnitude longer than that of any subsequent element. All isotopes with an atomic number above 101 undergo radioactive decay with half - lives of less than 30 hours. No elements with atomic numbers above 82 ( after lead ) have stable isotopes. This is because of the ever - increasing Coulomb repulsion of protons, so that the strong nuclear force can not hold the nucleus together against spontaneous fission for long. Calculations suggest that in the absence of other stabilizing factors, elements with more than 103 protons should not exist. However, researchers in the 1960s suggested that the closed nuclear shells around 114 protons and 184 neutrons should counteract this instability, creating an `` island of stability '' where nuclides could have half - lives reaching thousands or millions of years. While scientists have still not reached the island, the mere existence of the superheavy elements ( including oganesson ) confirms that this stabilizing effect is real, and in general the known superheavy nuclides become exponentially longer - lived as they approach the predicted location of the island. Oganesson is radioactive and has a half - life that appears to be less than a millisecond. Nonetheless, this is still longer than some predicted values, thus giving further support to the idea of this `` island of stability ''. Calculations using a quantum - tunneling model predict the existence of several neutron - rich isotopes of oganesson with alpha - decay half - lives close to 1 ms. Theoretical calculations done on the synthetic pathways for, and the half - life of, other isotopes have shown that some could be slightly more stable than the synthesized isotope Og, most likely Og, Og, Og, Og, Og, Og and Og. Of these, Og might provide the best chances for obtaining longer - lived nuclei, and thus might become the focus of future work with this element. Some isotopes with many more neutrons, such as some located around Og, could also provide longer - lived nuclei. Since these heavier isotopes greatly facilitate future chemical studies of oganesson, due to their expected longer half - lives, the Dubna team plans to conduct an experiment through the second half of 2017 with a heavier target containing a mix of the isotopes Cf, Cf, and Cf with Ca projectiles, aimed at the synthesis of the new isotopes Og and Og ; a repeat of this reaction in 2020 at the JINR is planned to produce Og. The production of Og and its daughter Lv in this reaction is also possible. The isotopes Og and Og may also be produced in the fusion of Cm with Ti projectiles, a reaction planned at the JINR and at RIKEN in 2017 -- 2018. Calculated atomic and Physical properties Oganesson is a member of group 18, the zero - valence elements. The members of this group are usually inert to most common chemical reactions ( for example, combustion ) because the outer valence shell is completely filled with eight electrons. This produces a stable, minimum energy configuration in which the outer electrons are tightly bound. It is thought that similarly, oganesson has a closed outer valence shell in which its valence electrons are arranged in a 7s 7p configuration. Consequently, some expect oganesson to have similar physical and chemical properties to other members of its group, most closely resembling the noble gas above it in the periodic table, radon. Following the periodic trend, oganesson would be expected to be slightly more reactive than radon. However, theoretical calculations have shown that it could be significantly more reactive. In addition to being far more reactive than radon, oganesson may be even more reactive than the elements flerovium and copernicium, which are heavier homologs of the more chemically active elements lead and mercury respectively. The reason for the possible enhancement of the chemical activity of oganesson relative to radon is an energetic destabilization and a radial expansion of the last occupied 7p - subshell. More precisely, considerable spin -- orbit interactions between the 7p electrons and the inert 7s electrons effectively lead to a second valence shell closing at flerovium, and a significant decrease in stabilization of the closed shell of oganesson. It has also been calculated that oganesson, unlike the other noble gases, binds an electron with release of energy, or in other words, it exhibits positive electron affinity, due to the relativistically stabilized 8s energy level and the destabilized 7p level, whereas copernicium and flerovium are predicted to have no electron affinity. Nevertheless, quantum electrodynamic corrections have been shown to be quite significant in reducing this affinity by decreasing the binding in the anion Og by 9 %, thus confirming the importance of these corrections in superheavy elements. Oganesson is expected to have an extremely broad polarizability, almost double that of radon. By extrapolating from the other noble gases, it is expected that oganesson has a boiling point between 320 and 380 K. This is very different from the previously estimated values of 263 K or 247 K. Even given the large uncertainties of the calculations, it seems highly unlikely that oganesson would be a gas under standard conditions, and as the liquid range of the other gases is very narrow, between 2 and 9 kelvins, this element should be solid at standard conditions. If oganesson forms a gas under standard conditions nevertheless, it would be one of the densest gaseous substances at standard conditions, even if it is monatomic like the other noble gases. Because of its tremendous polarizability, oganesson is expected to have an anomalously low ionization energy ( similar to that of lead which is 70 % of that of radon and significantly smaller than that of flerovium ) and a standard state condensed phase. Even the shell structure in the nucleus and electron cloud of oganesson is strongly impacted by relativistic effects : the valence and core electron subshells in oganesson are expected to be `` smeared out '' in a homogeneous Fermi gas of electrons, unlike those of the `` less relativistic '' radon and xenon ( although there is some incipient delocalisation in radon ), due to the very strong spin - orbit splitting of the 7p orbital in oganesson. A similar effect for nucleons, particularly neutrons, is incipient in the closed - neutron - shell nucleus Og and is strongly in force at the hypothetical superheavy closed - shell nucleus 164, with 164 protons and 308 neutrons. Predicted compounds XeF has a square planar molecular geometry. OgF is predicted to have a tetrahedral molecular geometry. The only confirmed isotope of oganesson, Og, has much too short a half - life to be chemically investigated experimentally. As such, no compounds of oganesson have been synthesized yet. Nevertheless, calculations on theoretical compounds have been performed since 1964. It is expected that if the ionization energy of the element is high enough, it will be difficult to oxidize and therefore, the most common oxidation state would be 0 ( as for the noble gases ) ; nevertheless, this appears not to be the case. Calculations on the diatomic molecule Og showed a bonding interaction roughly equivalent to that calculated for Hg, and a dissociation energy of 6 kJ / mol, roughly 4 times of that of Rn. Most strikingly, it was calculated to have a bond length shorter than in Rn by 0.16 Å, which would be indicative of a significant bonding interaction. On the other hand, the compound OgH exhibits a dissociation energy ( in other words proton affinity of oganesson ) that is smaller than that of RnH. The bonding between oganesson and hydrogen in OgH is predicted to be very weak and can be regarded as a pure van der Waals interaction rather than a true chemical bond. On the other hand, with highly electronegative elements, oganesson seems to form more stable compounds than for example copernicium or flerovium. The stable oxidation states + 2 and + 4 have been predicted to exist in the fluorides OgF and OgF. The + 6 state would be less stable due to the strong binding of the 7p subshell. This is a result of the same spin - orbit interactions that make oganesson unusually reactive. For example, it was shown that the reaction of oganesson with F to form the compound OgF would release an energy of 106 kcal / mol of which about 46 kcal / mol come from these interactions. For comparison, the spin - orbit interaction for the similar molecule RnF is about 10 kcal / mol out of a formation energy of 49 kcal / mol. The same interaction stabilizes the tetrahedral T configuration for OgF, as distinct from the square planar D one of XeF, which RnF is also expected to have. The Og -- F bond will most probably be ionic rather than covalent, rendering the oganesson fluorides non-volatile. OgF is predicted to be partially ionic due to oganesson 's high electropositivity. Unlike the other noble gases ( except possibly xenon and radon ), oganesson is predicted to be sufficiently electropositive to form an Og -- Cl bond with chlorine. See also Transactinide element Transuranic element References Jump up ^ Ritter, Malcolm ( 9 June 2016 ). `` Periodic table elements named for Moscow, Japan, Tennessee ''. Associated Press. Retrieved 19 December 2017. ^ Jump up to : Nash, Clinton S. ( 2005 ). `` Atomic and Molecular Properties of Elements 112, 114, and 118 ''. 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( 2006 ). `` α decay half - lives of new superheavy elements ''. Phys. Rev. C. 73 : 014612. arXiv : nucl - th / 0507054. Bibcode : 2006PhRvC... 73a4612C. doi : 10.1103 / PhysRevC. 73.014612. Jump up ^ Oganessian, Yu. Ts. ; Utyonkov, V. ; Lobanov, Yu. ; Abdullin, F. ; Polyakov, A. ; Shirokovsky, I. ; Tsyganov, Yu. ; Gulbekian, G. ; Bogomolov, S. ; Gikal, B.N. ; et al. ( 2004 ). `` Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions U, Pu, and Cm+ Ca '' ( PDF ). Physical Review C. 70 ( 6 ) : 064609. Bibcode : 2004PhRvC... 70f4609O. doi : 10.1103 / PhysRevC. 70.064609. Jump up ^ Samanta, C. ; Chowdhury, R.P. ; Basu, D.N. ( 2007 ). `` Predictions of alpha decay half - lives of heavy and superheavy elements ''. Nucl. Phys. A. 789 : 142 -- 154. arXiv : nucl - th / 0703086. Bibcode : 2007NuPhA. 789... 142S. doi : 10.1016 / j. nuclphysa. 2007.04. 001. 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PMID 12712201. Jump up ^ Considine, G.D. ; Kulik, Peter H. ( 2002 ). Van Nostrand 's scientific encyclopedia ( 9th ed. ). Wiley - Interscience. ISBN 978 - 0 - 471 - 33230 - 5. OCLC 223349096. Jump up ^ Oganessian, Yu. Ts. ; Sobiczewski, A. ; Ter - Akopian, G.M. ( 9 January 2017 ). `` Superheavy nuclei : from predictions to discovery ''. Physica Scripta. 92 ( 2 ) : 023003 -- 1 -- 21. Bibcode : 2017PhyS... 92b3003O. doi : 10.1088 / 1402 - 4896 / aa53c1. Jump up ^ Oganessian, Yu. T. ( 2007 ). `` Heaviest nuclei from Ca - induced reactions ''. Journal of Physics G : Nuclear and Particle Physics. 34 ( 4 ) : R165 -- R242. Bibcode : 2007JPhG... 34... 165O. doi : 10.1088 / 0954 - 3899 / 34 / 4 / R01. Jump up ^ `` New Element Isolated Only Briefly ''. The Daily Californian. 18 October 2006. Archived from the original on 23 August 2014. Retrieved 18 January 2008. Jump up ^ Chowdhury, Roy P. ; Samanta, C. ; Basu, D.N. 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( 2004 ). `` Half - life predictions for decay modes of superheavy nuclei '' ( PDF ). Journal of Physics G : Nuclear and Particle Physics. 30 ( 10 ) : 1487 -- 1494. Bibcode : 2004JPhG... 30.1487 D. doi : 10.1088 / 0954 - 3899 / 30 / 10 / 014. Jump up ^ Sychev, Vladimir ( 8 February 2017 ). `` Юрий Оганесян : мы хотим узнать, где кончается таблица Менделеева '' ( Yuri Oganessian : we want to know where the Mendeleev table ends ). RIA Novosti ( in Russian ). Retrieved 31 March 2017. Jump up ^ Roberto, J.B. ( 31 March 2015 ). `` Actinide Targets for Super-Heavy Element Research '' ( PDF ). cyclotron.tamu.edu. Texas A & M University. Retrieved 28 April 2017. Jump up ^ Bader, Richard F.W. `` An Introduction to the Electronic Structure of Atoms and Molecules ''. McMaster University. Retrieved 18 January 2008. Jump up ^ `` Ununoctium ( Uuo ) -- Chemical properties, Health and Environmental effects ''. Lenntech. Archived from the original on 16 January 2008. 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Jump up ^ Borschevsky, Anastasia ; Pershina, Valeria ; Kaldor, Uzi ; Eliav, Ephraim. `` Fully relativistic ab initio studies of superheavy elements '' ( PDF ). www.kernchemie.uni-mainz.de. Johannes Gutenberg University Mainz. Archived from the original ( PDF ) on 15 January 2018. Retrieved 15 January 2018. Jump up ^ Borschevsky, Anastasia ; Pershina, Valeria ; Eliav, Ephraim ; Kaldor, Uzi ( 27 August 2009 ). `` Electron affinity of element 114, with comparison to Sn and Pb ''. Chemical Physics Letters. 480 : 49 -- 51. Bibcode : 2009CPL... 480... 49B. doi : 10.1016 / j. cplett. 2009.08. 059. Jump up ^ Seaborg, Glenn Theodore ( 1994 ). Modern Alchemy. World Scientific. p. 172. ISBN 981 - 02 - 1440 - 5. Jump up ^ Takahashi, N. ( 2002 ). `` Boiling points of the superheavy elements 117 and 118 ''. Journal of Radioanalytical and Nuclear Chemistry. 251 ( 2 ) : 299 -- 301. doi : 10.1023 / A : 1014880730282. Jump up ^ Nash, Clinton S. ; Bursten, Bruce E. ( 1999 ). `` Spin - Orbit Effects, VSEPR Theory, and the Electronic Structures of Heavy and Superheavy Group IVA Hydrides and Group VIIIA Tetrafluorides. A Partial Role Reversal for Elements 114 and 118 ''. Journal of Physical Chemistry A. 1999 ( 3 ) : 402 -- 410. Bibcode : 1999JPCA... 103... 402N. doi : 10.1021 / jp982735k. ^ Jump up to : Jerabek, Paul ; Schuetrumpf, Bastian ; Schwerdtfeger, Peter ; Nazarewicz, Witold ( 2018 ). `` Electron and Nucleon Localization Functions of Oganesson : Approaching the Thomas - Fermi Limit ''. Phys. Rev. Lett. 120 ( 5 ) : 053001. arXiv : 1707.08710. Bibcode : 2018PhRvL. 120e3001J. doi : 10.1103 / PhysRevLett. 120.053001. Jump up ^ `` Ununoctium : Binary Compounds ''. WebElements Periodic Table. Retrieved 18 January 2008. ^ Jump up to : Han, Young - Kyu ; Lee, Yoon Sup ( 1999 ). `` Structures of RgFn ( Rg = Xe, Rn, and Element 118. n = 2, 4. ) Calculated by Two - component Spin - Orbit Methods. A Spin - Orbit Induced Isomer of ( 118 ) F ''. Journal of Physical Chemistry A. 103 ( 8 ) : 1104 -- 1108. Bibcode : 1999JPCA... 103.1104 H. doi : 10.1021 / jp983665k. Jump up ^ Pitzer, Kenneth S. ( 1975 ). `` Fluorides of radon and element 118 ''. Journal of the Chemical Society, Chemical Communications ( 18 ) : 760 -- 761. doi : 10.1039 / C3975000760b. ^ Jump up to : Seaborg, Glenn Theodore ( c. 2006 ). `` transuranium element ( chemical element ) ''. Encyclopædia Britannica. Retrieved 16 March 2010. Jump up ^ 张青莲 ( November 1991 ). 《 无机 化学 丛书 》 第 一 卷 : 稀有 气体 、 氢 、 碱 金属 ( in Chinese ). Beijing : Science Press. pp. P72. ISBN 7 - 03 - 002238 - 6. Jump up ^ Proserpio, Davide M. ; Hoffmann, Roald ; Janda, Kenneth C. ( 1991 ). `` The xenon - chlorine conundrum : van der Waals complex or linear molecule ? ''. Journal of the American Chemical Society. 113 ( 19 ) : 7184. doi : 10.1021 / ja00019a014. Further reading Scerri, Eric ( 2007 ). The Periodic Table, Its Story and Its Significance. New York : Oxford University Press. ISBN 978 - 0 - 19 - 530573 - 9. External links Element 118 : experiments on discovery, archive of discoverers ' official web page It 's Elemental : Oganesson Oganesson at The Periodic Table of Videos ( University of Nottingham ) On the Claims for Discovery of Elements 110, 111, 112, 114, 116, and 118 ( IUPAC Technical Report ) `` Element 118, Heaviest Ever, Reported for 1,000 th of a Second '', NYTimes.com. WebElements : Oganesson Periodic table ( Large cells ) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 He Li Be Ne Na Mg Al Si Cl Ar Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te Xe 6 Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 7 Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Alkali metal Alkaline earth metal Lanthanide Actinide Transition metal Post - ​ transition metal Metalloid Reactive nonmetal Noble gas Unknown chemical properties Books View or order collections of articles Oganesson Period 7 elements Noble gases Chemical elements ( sorted alphabetically ) Chemical elements ( sorted by number ) Portals Access related topics Chemistry portal Physics portal Russia portal United States portal Find out more on Wikipedia 's Sister projects Media from Commons News stories from Wikinews Definitions from Wiktionary LCCN : sh2012003545 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Oganesson&oldid=857092536 '' Categories : Oganesson Chemical elements Noble gases Synthetic elements Hidden categories : CS1 maint : BOT : original - url status unknown CS1 Russian - language sources ( ru ) CS1 uses Chinese - language script ( zh ) CS1 Chinese - language sources ( zh ) Articles with short description Use dmy dates from January 2016 Featured articles Wikipedia articles with LCCN identifiers Talk Contents About Wikipedia Afrikaans Alemannisch አማርኛ Aragonés Armãneashti Asturianu Azərbaycanca বাংলা Bân - lâm - gú Беларуская Беларуская ( тарашкевіца ) ‎ Български Bosanski Català Чӑвашла Cebuano Čeština Corsu Cymraeg Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Fiji Hindi Føroyskt Français Frysk Furlan Gaeilge Gaelg Gàidhlig Galego 贛 語 客家 語 / Hak - kâ - ngî Хальмг 한국어 Հայերեն हिन्दी Hrvatski Bahasa Indonesia Interlingua Italiano עברית ಕನ್ನಡ ქართული Қазақша Коми Кырык мары Latina Latviešu Lëtzebuergesch Lietuvių Ligure Limburgs Magyar Македонски മലയാളം मराठी Bahasa Melayu Mìng - dĕ̤ng - ngṳ̄ Nederlands नेपाली 日本 語 Nordfriisk Norsk Norsk nynorsk Occitan Oʻzbekcha / ўзбекча Plattdüütsch Polski Português Română Runa Simi Русский Scots Seeltersk Shqip Sicilianu Simple English Slovenčina Slovenščina Soomaaliga کوردی Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska Tagalog தமிழ் Татарча / tatarça తెలుగు ไทย Türkçe Українська اردو ئۇيغۇرچە / Uyghurche Vèneto Vepsän kel ' Tiếng Việt 文言 Winaray Yorùbá 粵語 中文 Kabɩyɛ 101 more Edit links This page was last edited on 29 August 2018, at 14 : 29 ( UTC ). 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Question: what is the 118th element on the periodic table
Answer: Oganesson