Atomic Facts & Figures

Roentgenium Facts

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Roentgenium
111Rg
Appearance
silvery (predicted)[1]
General properties
Name, symbol, number roentgenium, Rg, 111
Pronunciation Listeni/rʌntˈɡɛniəm/
runt-gen-ee-əm
or /rɛntˈɡɛniəm/
rent-gen-ee-əm
Metallic category unknown
but probably a transition metal
Group, period,block 11, 7, d
Standard atomic weight [281]
Electron configuration [Rn] 5f14 6d9 7s2
(predicted)[1][2]
2, 8, 18, 32, 32, 17, 2
(predicted)
Electron shells of roentgenium (2, 8, 18, 32, 32, 17, 2(predicted))
History
Discovery <ür Schwerionenforschung">Gesellschaft für Schwerionenforschung (1994)
Physical properties
Phase solid (predicted)[3]
Density (nearr.t.) 28.7 (predicted)[2] g·cm−3
Atomic properties
Oxidation states 5, 3, 1, −1 (predicted)[2]
Ionization energies
(more)
1st: 1022.7 (estimated)[2]kJ·mol−1
2nd: 2074.4 (estimated)[2]kJ·mol−1
3rd: 3077.9 (estimated)[2]kJ·mol−1
Atomic radius 114 (predicted)[2] pm
Covalent radius 121 (estimated)[4] pm
Miscellanea
CAS registry number 54386-24-2
Most stable isotopes
Main article: Isotopes of roentgenium
iso NA half-life DM DE (MeV) DP
282Rg syn 0.5 s α 9.00 278Mt
281Rg syn 26 s SF
280Rg syn 3.6 s α 9.75 276Mt
279Rg syn 0.17 s α 10.37 275Mt
only isotopes with half-lives over 0.1 seconds are included here

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