| LC control no. | sh2012003700 |
|---|---|
| LC classification | QD181.R47 General and inorganic chemistry QD412.R47 Organometallic chemistry |
| Topical heading | Roentgenium |
| Variant(s) | Unununium |
| See also | Superheavy elements |
| Found in | Work cat.: Hall, L.E. The transactinides : rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, 2010: p. 39 (Element 111, roentgenium) Overbye, D. Three new elements named : darmstadtium, roentgenium, and copernicium, in New York times, Nov. 4, 2011, viewed online Sept. 13, 2012 (Three newly discovered elements were given names on Friday by the General Assembly of the International Union of Pure and Applied Physics at a meeting in London; Roentgenium, or Rg, with 111 protons, named after the discoverer of X-rays Wilhelm Conrad Roentgen; None of these elements occur in nature, or even last very long once created. They were all made in Darmstadt, Germany, at the Society for Heavy Ion Research Laboratory (Gesellschaft für Schwerionenforschung) by bombarding heavy nuclei with beams of other atom) Welsh, J. 3 new heavy elements named: darmstadtium, roentgenium, copernicium, via Live science website, 4 Nov. 2011, viewed Sept. 13, 2012 (The names of three new elements were approved on November 4 by the General Assembly of the International Union of Pure and Applied Physics. Elements 110, 111 and 112 have been named darmstadtium (Ds), roentgenium (Rg) and copernicium (Cn); called "super heavy," or transuranium, elements; Element number 111, officially renamed roentgenium by the General Assembly, was originally discovered in 1994 when a team at GSI created three atoms of the element, about a month after their discovery of darmstadtium, on Dec. 8; its temporary name was unununium) Wikipedia, Sept. 13, 2012 (Roentgenium is a synthetic radioactive chemical element with the symbol Rg and atomic number 111. It is placed as the heaviest member of the group 11 (IB) elements, although a sufficiently stable isotope has not yet been produced in a sufficient amount that would confirm this position as a heavier homologue of gold. Roentgenium was first observed in 1994 and several isotopes have been synthesized since its discovery. The name roentgenium (Rg) was accepted by IUPAC on Nov. 1, 2004 and approved by IUPAP on November 4, 2011. Previously, the element was known under the temporary IUPAC systematic element name unununium with symbol Uuu. Element category: unknown, but probably a transition metal) The element roentgenium, via It's elemental - the periodic table of elements website, Sept. 13, 2012 (Rg; Roentgenium; Atomic Number: 111; Atomic Weight: 281; Phase at Room Temperature: Expected to be a Solid; Element Classification: Metal; Period Number: 7; Group Number: 11; Group Name: none; Radioactive and artificially produced) WebElements: the periodic table on the web, Sept. 13, 2012 (element 111, roentgenium, was discovered on 8th December 1994 at the GSI in Darmstadt, Germany; Symbol: Rg; Atomic number: 111; Group in periodic table: 11; Group name: (none); Period in periodic table: 7; Block in periodic table: d-block; Colour: unknown, but probably metallic and silvery white or grey in appearance; Classification: Metallic) OCLC, Sept. 13, 2012 (titles: The new element 111; The synthesis of an isotope of the new element 114 with mass number 287; Taufe von Element 111; The chemistry of the superheavy elements. II, The stability of high oxidation states in group 11 elements : relativistic coupled cluster calculations for the di-, tetra- and hexafluoro metallates of Cu, Ag, Au, and element 111; Seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, and copernicium (chemistry and applications; Isotopes of roentgenium) Webster's new world college dictionary, ©2010, via yourdictionary.com, Sept. 13, 2012: unununium (element 111: symbol, Uuu: a temporary name proposed for use until an official name is adopted) element 111 (a radioactive chemical element with a very short half-life: a transactinide produced by bombarding bismuth with nickel atoms: at. no., 111; unununium) The American heritage science dictionary, ©2005, via TheFreeDictionary.com, Sept. 13, 2012 (element 111: Symbol Uuu An artificially produced radioactive element whose isotope has a mass number of 272 and a half-life of 1.5 milliseconds. Atomic number 111. Also called unununium) |
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