Title: Roentgenium

CAS Registry Number: 54386-24-2

Additional Names: Element 111; unununium

Literature References: Rg, Uuu; at. no. 111. Group Ib (11). Transuranium element. No stable nuclides. Prepn and decay of isotope 272111 (T½ ~1.5 msec, a decay) by 209Bi(64Ni,n): S. Hofmann et al., Z. Phys. A 350, 281 (1995). Synthesis and decay chains: idem et al,, Eur. Phys. J. A 14, 147 (2002). Name and symbol approved: J. Corish, G. M. Rosenblatt, Pure Appl. Chem. 76, 2101 (2004). Review of production and properties: idem, Rep. Prog. Phys. 61, 639-689 (1998).