röntgenium

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, Auᴵ is smaller than Agᴵ. 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, 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

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).

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

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.

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

p. 237, “spelling disagreement”: Aside from differences between languages, other spelling discrepancies within a language occur with cesium, which the British tend to spell “caesium,” and sulfur, which many people still spell “sulphur.” You could make a case that element 110 should be spelled mendeleevium, not mendelevium, and that element 111 should be spelled röntgenium, not roentgenium.

[2010, Sam Kean, “Notes and Errata”, in The Disappearing Spoon: And Other True Tales of Madness, Love, and the History of the World from the Periodic Table of the Elements, Doubleday, published 2011, →ISBN, page 366

The reader who has encountered any of the entries for: curium, einsteinium, fermium, mendelevium, nobelium, lawrencium, rutherfordium, seaborgium, bohrium, meitnerium and röntgenium, will have realised that it is a mark of the highest distinction in science to have a chemical element named after one.

[2010, Roger Jones, Mike Ware, “[349] Ghiorsium”, in What’s Who?: A Dictionary of things named after people and the people they are named after, new edition, Matador (Troubador Publishing Ltd), →ISBN, pages 146–147