| LC control no. | sh2012003545 |
|---|---|
| Topical heading | Oganesson |
| Variant(s) | Eka-emanation Eka-radon Ununoctium |
| See also | Gases, Rare Superheavy elements |
| Found in | Work cat.: Aldridge, S. Ununquadium, ununtrium, ununpentium, ununhexium, ununseptium, and ununoctium, 2012. Wikipedia, Aug. 31, 2012 (Ununoctium is the temporary IUPAC name for the transactinide element having the atomic number 118 and temporary element symbol Uuo. It is also known as eka-radon or element 118, and on the periodic table of the elements it is a p-block element and the last one of the 7th period. Ununoctium is currently the only synthetic member of Group 18. It has the highest atomic number and highest atomic mass of all the elements discovered so far. Element category: unknown. Until the 1960s ununoctium was known as eka-emanation (emanation is the old name for radon). In 1979 the IUPAC published recommendations according to which the element was to be called ununoctium, a systematic element name, as a placeholder until the discovery of the element is confirmed and the IUPAC decides on a name. No name has yet been officially suggested for the element.) The element ununoctium, via It's elemental : the periodic table of elements website, Aug. 31, 2012 (Ununoctium; Uuo; Atomic Number: 118; Atomic Weight: 294; Phase at Room Temperature: Expected to be a Gas; Element Classification: Non-metal; Period Number: 7; Group Number: 18; Group Name: Noble Gas; radioactive and artificially produced; temporary name that means one-one-eight; On October 16, 2006, scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, along with scientists from the U.S. Department of Energy's Lawrence Livermore National Laboratory, announced the creation of ununoctium. They produced ununoctium by bombarding atoms of californium-249 with ions of calcium-48. This produced ununoctium-294, an isotope with a half-life of about 0.89 milliseconds (0.00089 seconds), and three free neutrons. The californium target was irradiated with a total of 1.6*10¹⁹ calcium ions over the course of 1080 hours, resulting in the production of three atoms of ununoctium. Ununoctium's most stable isotope, ununoctium-294, has a half-life of about 0.89 milliseconds. It decays into livermorium-290 through alpha decay.) The element oganesson, via It's elemental : the periodic table of elements website, June 20, 2016 (Oganesson; Og; Atomic Number: 118; Atomic Weight: 294) WebElements : the periodic table on the web, Aug. 31, 2012 (Ununoctium; Uuo; Group in periodic table: 18; Group name: Noble gas; Period in periodic table: 7; Block in periodic table: p-block; Colour: unknown, but probably a colourless gas; Classification: Non-metallic; experiments conducted at Dubna in Russia at the Flerov Laboratory of Nuclear Reactions (by workers from the Joint Institute for Nuclear Research in Russia and the Lawrence Livermore National Laboratory in the USA) indicate that element 118 (ununoctium, Uuo) was produced. Not too much though, one atom in the spring of 2002 and two more in 2005.) June 20, 2016 (Oganesson; Og; On 8 June 2016 IUPAC announced the new name oganesson (symbol Og) for element 118) IUPAC is naming the four new elements nihonium, moscovium, tennessine, and oganesson, 8 June 2016, via International Union of Pure and Applied Chemistry website, viewed June 20, 2016 (Oganesson and symbol Og, for the element 118; For the element with atomic number 118 the collaborating teams of discoverers at the Joint Institute for Nuclear Research, Dubna (Russia) and Lawrence Livermore National Laboratory (USA) proposed the name oganesson and symbol Og. The proposal is in line with the tradition of honoring a scientist and recognizes Professor Yuri Oganessian (born 1933) for his pioneering contributions to transactinoid elements research) |
 |  |  |