röntgenium

röntgenium (uncountable)

1. Rare spelling of roentgenium.
   • 2006, Geoffrey C. Bond, Catherine Louis, David T. Thompson, “Chapter 2. The Physical and Chemical Properties of Gold”, in Graham J. Hutchings, editor, Catalysis by Gold (Catalytic Science Series — Vol. 6), Imperial College Press, →ISBN, “5. Physical Properties of Gold and Adjacent Elements 1. Bulk properties”, page 30:

     Gold crystallises in the face-centred cubic (fcc) habit, its lattice constant being fractionally smaller than that of silver (Tables 2.1 and 2.2.); in compounds and complexes, Au^I is smaller than Ag^I. This is in consequence of the relativistic contraction of the 6s level, and it is expected that it will be even greater with the 7s level; indeed the size of the next element of Group 11 (röntgenium) has been calculated to be no larger than that of copper.

   • 2006 May, György Inzelt, “2. Standard, Formal, and Other Characteristic Potentials of Selected Electrode Reactions”, in Allen J. Bard, Fritz Scholz Martin Stratmann, Christopher J. Pickett, editors, Inorganic Chemistry (Encyclopedia of Electrochemistry, vol. 7a), Wiley-VCH, →ISBN, “11. Group 11 Elements”, pages 43, 47:

     Copper (^63.546₂₉Cu), OS: +2, +1, 0; IE: 745.3, 1957.3, 3577.6 kJ mol⁻¹. […] Röntgenium (₁₁₁Rg) / No data are available.

   • 2008, H.-J. Kluge, T. Beier, K. Blaum, L. Dahl, S. Eliseev, F. Herfurth, B. Hofmann, O. Kester, S. Koszudowski, C. Kozhuharov, G. Maero, W. Nörtershäuser, J. Pfister, W. Quint, U. Ratzinger, A. Schempp, R. Schuch, Th. Stöhlker, R.C. Thompson, M. Vogel, G. Vorobjev, D.F.A. Winters, G. Werth, “Chapter 7. HITRAP: A Facility at GSI for Highly Charged Ions”, in Advances in Quantum Chemistry, volume 53, Academic Press, →ISBN, “1. The Present GSI Facility”, page 84:

     One example is SHIPTRAP, its name originating from the SHIP velocity filter that was used to discover six new elements: ²⁶⁴₁₀₇Bh (Bohrium, 1981), ²⁶⁹₁₀₈Hs (Hassium, 1984), ²⁶⁸₁₀₉Mt (Meitnerium, 1982), ²⁷¹₁₁₀Ds (Darmstadtium, 1994), ²⁷²₁₁₁Rg (Röntgenium, 1994), and ²⁷⁷₁₁₂Uub (Ununbium, 1996).

   • 2010, V. Pershina, “Relativistic electronic structure studies on the heaviest elements”, in Radiochimica Acta, Oldenbourg Wissenschaftsverlag, “5.2. Röntgenium”, page 465:

     Possibility of Rg to form simple monovalent compounds and predominance of relativistic effects on its electron shells made this element an attractive object of theoretical investigations.