Oganesson, 118 General properties Pronunciation Template:Infobox element/pronunciation Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope) (unconfirmed: 295)Oganesson in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 118 Group Template:Infobox element/group Period period 7 Block p-block Element category Template:Infobox element/category format , but probably a noble gas Electron configuration [Rn ] 5f14 6d10 7s2 7p6 (predicted) [1] [2] Electrons per shell
2, 8, 18, 32, 32, 18, 8 (predicted) Physical properties Phase at STP solid (predicted) [1] Boiling point 350±30 K (80±30 °C, 170±50 °F) (extrapolated) [1] Density when liquid (at m.p. ) 4.9–5.1 g/cm3 (predicted) [3] Critical point 439 K, 6.8 MPa (extrapolated) [4] Heat of fusion 23.5 kJ/mol (extrapolated) [4] [[Enthalpy of vaporization|Heat of Template:Engvar ]] 19.4 kJ/mol (extrapolated) [4] Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state [[Ionization energy|Template:Engvar energies]] 1st: 860.1 kJ/mol (predicted) [5] 2nd: 1560 kJ/mol (predicted) [6] Covalent radius 157 pm (predicted) [7] Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure (extrapolated) [8] 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 Template:Infobox element/isotopes table | references
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↑ 1.0 1.1 1.2 Nash, Clinton S. (2005). "Atomic and Molecular Properties of Elements 112, 114, and 118". Journal of Physical Chemistry A . 109 (15): 3493–3500. Bibcode :2005JPCA..109.3493N . doi :10.1021/jp050736o . PMID 16833687 . ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Haire ↑ Bonchev, Danail; Kamenska, Verginia (1981). "Predicting the Properties of the 113–120 Transactinide Elements" . Journal of Physical Chemistry . American Chemical Society. 85 (9): 1177–1186. doi :10.1021/j150609a021 . ↑ 4.0 4.1 4.2 Eichler, R.; Eichler, B., Thermochemical Properties of the Elements Rn, 112, 114, and 118 (PDF) , Paul Scherrer Institut, retrieved 2010-10-23 ↑ Pershina, Valeria. "Theoretical Chemistry of the Heaviest Elements". In Schädel, Matthias; Shaughnessy, Dawn (eds.). The Chemistry of Superheavy Elements (2nd ed.). Springer Science & Business Media. p. 154. ISBN 9783642374661 ↑ Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties" . Recent Impact of Physics on Inorganic Chemistry . 21 : 89–144. doi :10.1007/BFb0116498 . Retrieved 4 October 2013 . ↑ Chemical Data. Ununoctium - Uuo , Royal Chemical Society↑ Grosse, A. V. (1965). "Some physical and chemical properties of element 118 (Eka-Em) and element 86 (Em)". Journal of Inorganic and Nuclear Chemistry . Elsevier Science Ltd. 27 (3): 509–19. doi :10.1016/0022-1902(65)80255-X .