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Name: Roentgenium (Unununium) |
Boiling Point: unknown Melting Point: unknown Electrons Energy Level: unknown Isotopes: 12 + None Stable Heat of Vaporization: unknown Heat of Fusion: unknown Density: unknown Specific Heat: unknown Atomic Radius: unknown Ionic Radius: unknown Electronegativity: unknown Vapor Pressure: unknown |
It was discovered by Peter Armbruster, Gottfried Münzenber and their team working at the Gesellschaft fur Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it were observed (all 272Rg), by the fusion of bismuth-209 and nickel-64 in a linear accelerator. (Nickel was bombarded onto the bismuth target.)
The name roentgenium was accepted as a permanent name on November 1, 2004 in honor of Wilhelm Roentgen; before this date, the element was known under the temporary IUPAC systematic element name unununium, symbol Uuu). Some research has referred to it as eka-gold.
The official baptism took place at GSI, on Friday November 17, 2006, in the presence of Annette Schavan, the Federal German Minister of Research.
One of the super-heavy atoms. It is a synthetic transition element whose presence in Group 11 probably would appear as a heavy, solid, shiny metal. Due to the inert pair effect, it should be colored like gold.
1s2 | ||||||
2s2 | 2p6 | |||||
3s2 | 3p6 | 3d10 | ||||
4s2 | 4p6 | 4d10 | 4f14 | |||
5s2 | 5p6 | 5d10 | 5f14 | |||
6s2 | 6p6 | 6d10 | ||||
7s1 |
Twelve isotopes of roentgenium are known. The longest-lived of these is 280Rg which decays through alpha decay and has a half-life of 3.6 seconds. The shortest-lived isotope is 272Rg which decays through alpha decay and has a half life of 2.0 ms. The other known isotope, 279Rg, decays through alpha decay and has a half-life of 0.17 seconds.
Isotope | Atomic Mass |
Half-Life |
---|---|---|
272Rg | 272.15362 | 2.0 ms |
273Rg | 273.15368 | ~5 ms |
274Rg | 274.15571 | 6.4 ms |
275Rg | 275.15614 | ~10 ms |
276Rg | 276.15849 | ~100 ms |
277Rg | 277.15952 | ~1 seconds |
278Rg | 278.16160 | ~1 seconds |
279Rg | 279.16247 | 0.17 seconds |
280Rg | 280.16447 | 3.6 seconds |
281Rg | 281.16537 | ~1 minutes |
282Rg | 282.16749 | ~4 minutes |
283Rg | 283.16842 | ~10 minutes |
Roentgenium Data |
|
Transition Metals | ||||||||||
Group | 3 (IIIB) |
4 (IVB) |
5 (VB) |
6 (VIB) |
7 (VIIB) |
8 (VIIIB) |
9 (VIIIB) |
10 (VIIIB) | 11 (IB) |
12 (IIB) |
Period 4 | 21 Sc 44.95 |
22 Ti 47.86 |
23 V 50.94 |
24 Cr 51.99 |
25 Mn 54.93 |
26 Fe 55.84 |
27 Co 58.93 |
28 Ni 58.69 |
29 Cu 63.54 |
30 Zn 65.39 |
Period 5 | 39 Y 88.90 |
40 Zr 91.22 |
41 Nb 92.90 |
42 Mo 95.94 |
43 Tc 98.00 |
44 Ru 101.0 |
45 Rh 102.9 |
46 Pd 106.4 |
47 Ag 107.8 |
48 Cd 112.4 |
Period 6 | 57 La 138.9 |
72 Hf 178.4 |
73 Ta 180.9 |
74 W 183.8 |
75 Re 186.2 |
76 Os 190.2 |
77 Ir 192.2 |
78 Pt 195.0 |
79 Au 196.9 |
80 Hg 200.5 |
Period 7 | 89 Ac 227.0 |
104 Rf 261.0 |
105 Db 262.0 |
106 Sg 266.0 |
107 Bh 264.0 |
108 Hs 269.0 |
109 Mt 268.0 |
110 Ds 269.0 |
111 Rg 272.0 |
112 Uub 277.0 |