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Encyclopedia > Ununoctium
118 ununseptium ← ununoctium → ununennium
Rn
↑
Uuo
↓
(Uho)
General
Name, Symbol, Number ununoctium, Uuo, 118
Chemical series noble gases
Group, Period, Block 18, 7, p
Appearance unknown, probably colorless
Atomic mass predicted, (314) g/mol
Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p6
(guess based on radon)
Electrons per shell 2, 8, 18, 32, 32, 18, 8
Phase presumably a gas
CAS registry number 54144-19-3
References

Ununoctium (IPA pronunciation: /ˌjuːnəˈnɒktiəm/ [1]) is the temporary IUPAC name for the superheavy element 118. It has the temporary IUPAC element symbol Uuo and has an atomic number of 118. It probably shares similar properties of its group, the noble gases, resembling radon in its chemical properties, and so some researchers have referred to it as eka-radon. It is probably the second radioactive gaseous element and the first standard semiconductive gas. General Name, Symbol, Number ununseptium, Uus, 117 Chemical series presumably halogens Group, Period, Block 17, 7, p Appearance unknown, probably dark metallic Atomic mass predicted, (310) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p5 (guess based on astatine) Electrons per shell 2, 8, 18, 32, 32, 18, 7... General Name, Symbol, Number ununennium, Uue, 119 Chemical series Presumably Alkali metals Group, Period, Block 1, 8, s Appearance unknown, probably metallic and silvery white or grey color Image:.jpg Atomic mass [295] amu(a guess) g/mol Electron configuration [Uuo] 8s1 (a guess based upon cesium and francium) Electrons... General Name, Symbol, Number radon, Rn, 86 Chemical series noble gases Group, Period, Block 18, 6, p Appearance colorless Atomic mass (222) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p6 Electrons per shell 2, 8, 18, 32, 18, 8 Physical properties Phase gas Density (0 °C, 101. ... Image File history File links Download high resolution version (890x260, 22 KB)for unified link coding, copy of File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... This is a standard display of the periodic table of elements. ... This extended periodic table was suggested by Glenn T. Seaborg in 1969. ... This is a list of chemical elements, sorted by name and color coded according to type of element. ... Categories: Chemical elements ... sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex sex... For the musical band, see Noble Gas (band) The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table. ... A periodic table group is a vertical column in the periodic table of the chemical elements. ... In the periodic table of the elements, a period is a row of the table. ... A block of the periodic table of elements is a set of adjacent groups. ... The noble gases are a chemical series. ... A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements. ... The p-block of the periodic table of elements consists of the last six groups. ... Color is an important part of the visual arts. ... The atomic mass of a chemical element is the mass of an atom at rest, most often expressed in unified atomic mass units. ... To help compare different orders of magnitude we list here masses between 60. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... General Name, Symbol, Number radon, Rn, 86 Chemical series noble gases Group, Period, Block 18, 6, p Appearance colorless Atomic mass (222) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p6 Electrons per shell 2, 8, 18, 32, 18, 8 Physical properties Phase gas Density (0 °C, 101. ... General Name, Symbol, Number radon, Rn, 86 Chemical series noble gases Group, Period, Block 18, 6, p Appearance colorless Atomic mass (222) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p6 Electrons per shell 2, 8, 18, 32, 18, 8 Physical properties Phase gas Density (0 °C, 101. ... Properties The electron is a lightweight fundamental subatomic particle that carries a negative electric charge. ... In atomic physics, an electron shell, also known as a main energy level, is a group of atomic orbitals with the same value of the principal quantum number n. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... A gas is one of the five main phases of matter (after solid and liquid, and followed by plasma and Bose-Einstein Condensate) and, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Recommended values for many properties of the elements, together with various references, are collected on these data pages. ... Image File history File links Wikinews-logo. ... Wikinews is a free-content news source and a project of the Wikimedia Foundation. ... This is a concise version of the International Phonetic Alphabet for English sounds. ... The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization devoted to the advancement of chemistry. ... In chemistry, transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92, the atomic number of Uranium. ... A chemical symbol is an abbreviation or short representation of the name of a chemical element. ... In chemistry and physics, the atomic number (Z) is the number of protons found in the nucleus of an atom. ... For the musical band, see Noble Gas (band) The noble gases are the chemical elements in group 18 (old-style Group 0) of the periodic table. ... General Name, Symbol, Number radon, Rn, 86 Chemical series noble gases Group, Period, Block 18, 6, p Appearance colorless Atomic mass (222) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p6 Electrons per shell 2, 8, 18, 32, 18, 8 Physical properties Phase gas Density (0 °C, 101. ... A chemical substance is any material substance used in or obtained by a process in chemistry: A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions. ... When Dmitri Mendeleev proposed his periodic table, he noted gaps in the table, and predicted that as of yet unknown elements existed with properties appropriate to fill those gaps. ... Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... For other meanings see gas (disambiguation). ... A semiconductor is a solid whose electrical conductivity can be controlled over a wide range, either permanently or dynamically. ...


Ignoring nuclear instability due to radioactivity, scientists expect that ununoctium is much more chemically reactive than xenon or radon. It would likely form stable oxides (UuoO3, etc.) as well as chlorides and fluorides. Radioactivity may mean: Look up radioactivity in Wiktionary, the free dictionary. ... General Name, Symbol, Number xenon, Xe, 54 Chemical series noble gases Group, Period, Block 18, 5, p Appearance colorless Atomic mass 131. ... General Name, Symbol, Number radon, Rn, 86 Chemical series noble gases Group, Period, Block 18, 6, p Appearance colorless Atomic mass (222) g/mol Electron configuration [Xe] 4f14 5d10 6s2 6p6 Electrons per shell 2, 8, 18, 32, 18, 8 Physical properties Phase gas Density (0 °C, 101. ... An oxide is a chemical compound of oxygen with other chemical elements. ... The chloride ion is formed when the element chlorine picks up one electron to form an anion (negatively-charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and are also called chlorides. ... A fluoride ion is the ionic form of fluorine. ...

Contents

History

The name ununoctium is used as a placeholder, as in scientific articles about the search for element 118. Transuranic elements (those beyond uranium) are, except for microscopic quantities, always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics (see systematic element name for more information). In 1999, researchers at Lawrence Berkeley National Laboratory announced the discovery of elements 116 and 118, in a paper published in Physical Review Letters. [2] For the World of Warcraft ex-NPC, see Captain Placeholder. ... In chemistry, transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92, the atomic number of Uranium. ... General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Atomic mass 238. ... In chemistry, heavy transuranic elements receive a permanent name and symbol only after their discovery has been confirmed. ... The Berkeley Lab is perched on a hill overlooking the Berkeley central campus and San Francisco Bay. ... General Name, Symbol, Number ununhexium, Uuh, 116 Chemical series presumably poor metals Group, Period, Block 16, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (302) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p4 (guess based on polonium) Electrons per shell 2, 8, 18, 32... Physical Review Letters is one of the most prestigious journals in physics. ...


The researchers claimed to have performed the reaction:

,^{86}_{36}mathrm{Kr} + ,^{208}_{82}mathrm{Pb} , to ,^{293}_{118}mathrm{Uuo} + 1 ; ^1_0mathrm{n} ;

The following year, they published a retraction after other researchers were unable to duplicate the results.[3] 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. Victor Ninov was a researcher in the nuclear chemistry group at Lawrence Berkeley National Laboratory who was alleged to have fabricated the evidence used to claim the creation of ununoctium and ununhexium. ...


The American group had intended to name it ghiorsium after Albert Ghiorso before having to retract their claim. Albert Ghiorso (b. ...


On October 10, 2006, researchers working at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, announced in Physical Review C that they had indirectly detected ununoctium-294 produced via collisions of californium-249 atoms and calcium-48 ions [4][5]: October 10 is the 283rd day of the year (284th in Leap years). ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... The Joint Institute for Nuclear Research, JINR (Объединённый институт ядерных исследований, ОИЯИ in Russian) in Dubna, Moscow Oblast (120 km north of Moscow), Russia is an international research centre for nuclear sciences, involving around 1000 scientists from eighteen states (Armenia, Azerbaijan, Belarus, Bulgaria, Cuba, Czech Republic, Georgia, Kazakhstan, DPR Korea, Moldova, Mongolia, Poland,Romania, Russia... The Joint Institute for Nuclear Research, JINR (Russian: ) in Dubna, Moscow Oblast (120 km north of Moscow), Russia is an international research centre for nuclear sciences, involving around 1000 scientists from eighteen states (Armenia, Azerbaijan, Belarus, Bulgaria, Cuba, Czech Republic, Georgia, Kazakhstan, DPR Korea, Moldova, Mongolia, Poland,Romania, Russia, Slovakia... Dubna is a small city located in central Russia, in the Taldomsky district of Moscow Oblast, approximately 125 km north of Moscow, on the banks of the Volga river. ... Physical Review is one of the oldest and most-respected scientific journals publishing research on all aspects of physics. ... General Name, Symbol, Number californium, Cf, 98 Chemical series actinides Group, Period, Block n/a, 7, f Appearance unknown, probably silvery white or metallic gray Atomic mass (251) g/mol Electron configuration [Rn] 5f10 7s2 Electrons per shell 2, 8, 18, 32, 28, 8, 2 Physical properties Phase solid Density... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40. ...

,^{249}_{98}mathrm{Cf} + ,^{48}_{20}mathrm{Ca} , to ,^{294}_{118}mathrm{Uuo} + 3 ; ^1_0mathrm{n} ;

The research team consisted of workers from JINR and the Lawrence Livermore National Laboratory in California, USA. The decay products of three atoms of ununoctium, not the atoms themselves, were observed in Dubna. A half-life of 0.89 ms was observed: 294Uuo decays into 290Uuh by alpha decay. 290Uuh is very unstable, decaying within a fraction of a second into 286Uuq, which may undergo spontaneous fission or undergo alpha decay into 282Uub, which will undergo spontaneous fission. [6] The Joint Institute for Nuclear Research, JINR (Russian: ) in Dubna, Moscow Oblast (120 km north of Moscow), Russia is an international research centre for nuclear sciences, involving around 1000 scientists from eighteen states (Armenia, Azerbaijan, Belarus, Bulgaria, Cuba, Czech Republic, Georgia, Kazakhstan, DPR Korea, Moldova, Mongolia, Poland,Romania, Russia, Slovakia... Aerial view of the lab and surrounding area. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... General Name, Symbol, Number ununhexium, Uuh, 116 Chemical series presumably poor metals Group, Period, Block 16, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (302) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p4 (guess based on polonium) Electrons per shell 2, 8, 18, 32... Alpha decay is a form of radioactive decay in which an atomic nucleus ejects an alpha particle through the electromagnetic force and transforms into a nucleus with mass number 4 less and atomic number 2 less. ... General Name, Symbol, Number ununquadium, Uuq, 114 Chemical series presumably poor metals Group, Period, Block 14, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (289) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p2 (guess based on lead) Electrons per shell 2, 8, 18, 32... Spontaneous fission (SF) is a form of radioactive decay characteristic of very heavy isotopes, and is theoretically possible for any atomic nucleus whose mass is greater than or equal to 100 amu (elements near ruthenium). ... General Name, Symbol, Number ununbium, Uub, 112 Chemical series transition metals Group, Period, Block 12, 7, d Appearance unknown, probably silvery white or metallic gray liquid Atomic mass (285) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 (guess based on mercury) Electrons per shell 2, 8, 18, 32, 32...


See also

The story of the discoveries of the chemical elements is presented here in chronological order. ... 3-dimensional rendering of the theoretical Island of Stability. ... General Name, Symbol, Number ununennium, Uue, 119 Chemical series Presumably Alkali metals Group, Period, Block 1, 8, s Appearance unknown, probably metallic and silvery white or grey color Image:.jpg Atomic mass [295] amu(a guess) g/mol Electron configuration [Uuo] 8s1 (a guess based upon cesium and francium) Electrons... General Name, Symbol, Number ununhexium, Uuh, 116 Chemical series presumably poor metals Group, Period, Block 16, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (302) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p4 (guess based on polonium) Electrons per shell 2, 8, 18, 32... General Name, Symbol, Number ununseptium, Uus, 117 Chemical series presumably halogens Group, Period, Block 17, 7, p Appearance unknown, probably dark metallic Atomic mass predicted, (310) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p5 (guess based on astatine) Electrons per shell 2, 8, 18, 32, 32, 18, 7...

References

  1. ^ Pronounced yoo'nànŏk`tēàm at Columbia Encyclopedia
  2. ^ Ninov, Viktor, K. E. Gregorich, W. Loveland, A. Ghiorso, D. C. Hoffman, D. M. Lee, H. Nitsche, W. J. Swiatecki, U. W. Kirbach, C. A. Laue, J. L. Adams, J. B. Patin, D. A. Shaughnessy, D. A. Strellis, and P. A. Wilk (1999-05-27). "Observation of Superheavy Nuclei Produced in the Reaction of 86Kr with 208Pb". Physical Review Letters 83 (6-9): 1104–1107. DOI:10.1103/PhysRevLett.83.1104. Retrieved on 2006-10-20.
  3. ^ Public Affairs Department. "Results of element 118 experiment retracted", Berkeley Lab, 2001-7-21. Retrieved on 2006-10-17.
  4. ^ Sanderson, Katherine (17 October 2006). Heaviest element made - again. nature@news.com. Nature (journal). Retrieved on 2006-10-19.
  5. ^ Phil Schewe and Ben Stein (17 October 2006). Elements 116 and 118 Are Discovered. Physics News Update. American Institute of Physics. Retrieved on 2006-10-19.
  6. ^ Oganessian, Yu. Ts., Utyonkov, V.K.; Lobanov, Yu.V.; Abdullin, F.Sh.; Polyakov, A.N.; Sagaidak, R.N.; Shirokovsky, I.V.; Tsyganov, Yu.S.; Voinov, Yu.S.; Gulbekian, G.G.; Bogomolov, S.L.; B. N. Gikal, A. N. Mezentsev, S. Iliev; Subbotin, V.G.; Sukhov, A.M.; Subotic, K; Zagrebaev, V.I.; Vostokin, G.K.; Itkis, M. G.; Moody, K.J; Patin, J.B.; Shaughnessy, D.A.; Stoyer, M.A.; Stoyer, N.J.; Wilk, P.A.; Kenneally, J.M.; Landrum, J.H.; Wild, J.H.; and Lougheed, R.W. (2006-10-09). "Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm+48Ca fusion reactions". Physical Review C 74 (4): 044602. DOI:10.1103/PhysRevC.74.044602. Retrieved on 2006-10-16.

Physical Review Letters is one of the most prestigious journals in physics. ... A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 20 is the 293rd day of the year (294th in leap years) in the Gregorian Calendar, with 72 days remaining. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 17 is the 290th day of the year (291st in leap years) in the Gregorian calendar. ... October 17 is the 290th day of the year (291st in leap years) in the Gregorian calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... First title page, November 4, 1869 Nature is one of the oldest and most reputable scientific journals, first published on 4 November 1869. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 19 is the 292nd day of the year (293rd in leap years) in the Gregorian calendar. ... October 17 is the 290th day of the year (291st in leap years) in the Gregorian calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... The American Institute of Physics (AIP) is a professional body representing American physicists and publishing physics related journals. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 19 is the 292nd day of the year (293rd in leap years) in the Gregorian calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 9 is the 282nd day of the year (283rd in leap years) in the Gregorian calendar. ... Physical Review is one of the oldest and most-respected scientific journals publishing research on all aspects of physics. ... A digital object identifier (or DOI) is a permanent identifier (permalink) given to a World Wide Web file or other Internet document so that if its Internet address changes, users will be redirected to its new address. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... October 16 is the 289th day of the year (290th in leap years). ...

External links

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  Results from FactBites:
 
Michael Swanwick's Periodic Table of Science Fiction (330 words)
Ununoctium was discovered in 1999 by a team of scientists at Berkeley Laboratory who created three atoms of Element 118 by fusing krypton-86 with lead-208.
Ununoctium, however, is a cat not only of a different color but of a different temperament altogether.
Neither viewpoint describes ununoctium as it really is. Because after it's all over and done with, it pops into existence again, as inevitable as the dawn.
  More results at FactBites »


 

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