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| Isotope Nuclide | E | N | Atomic Mass [Nuclear Mass] {Mass Excess} | Spin I (h/2π) | Parent |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| Roentgenium-272 | 272111Rg | 161 | 272.15327(25) u [272.092388 u] {142.77009 MeV} | 5+, 6+ | |
| Roentgenium-273 | 273111Rg | 162 | |||
| Roentgenium-274 | 274111Rg | 163 | 274.15525(23) u [274.094368 u] {144.61444 MeV} | 278Nh | |
| Roentgenium-275 | 275111Rg | 164 | |||
| Roentgenium-276 | 276111Rg | 165 | |||
| Roentgenium-277 | 277111Rg | 166 | |||
| Roentgenium-278 | 278111Rg | 167 | 278.16159(42) u [278.100708 u] {150.52012 MeV} | 282Nh | |
| Roentgenium-279 | 279111Rg | 168 | 279.16288(45) u [279.101998 u] {151.72174 MeV} | 283Nh | |
| Roentgenium-280 | 280111Rg | 169 | 280.16520(57) u [280.104318 u] {153.88281 MeV} | 284Nh | |
| Roentgenium-281 | 281111Rg | 170 | 281.16676(83) u [281.105878 u] {155.33594 MeV} | ||
| Roentgenium-282 | 282111Rg | 171 | 282.16934(63) u [282.108458 u] {157.73919 MeV} | ||
| Roentgenium-283 | 283111Rg | 172 | 283.17054(79) u [283.109658 u] {158.85699 MeV} | ||
| Roentgenium-284 | 284111Rg | 173 | |||
| Roentgenium-285 | 285111Rg | 174 | |||
| Roentgenium-286 | 286111Rg | 175 | 286.178760(490) u [286.117878 u] {166.51387 MeV} |
| Isotope | Radioactive Decay | Extern | |||
|---|---|---|---|---|---|
| Half-life | Decay Mode | Probability | Energy | ||
| 7 | 8 | 9 | 10 | 11 | 12 |
| Rg-272 | 0.0038 s | α → 268Mt | ca. 100 % | 11.197(13) MeV | AL |
| Rg-273 | - unknown - | ||||
| Rg-274 | 0.012 s | α → 270Mt | ca. 100 % | 11.478(86) MeV | AL |
| Rg-275 | - unknown - | ||||
| Rg-276 | - unknown - | ||||
| Rg-277 | - unknown - | ||||
| Rg-278 | 0.0042 s | α → 274Mt SF div | ca. 100 % ? | 10.846(95) MeV | AL |
| Rg-279 | 0.09 s | α → 275Mt | ca. 100 % | 10.530(168) MeV | AL |
| Rg-280 | 4.4 s | α → 276Mt | ca. 100 % | 10.149(10) MeV | AL |
| Rg-281 | 15 s | SF div α → 277Mt | 82 % 18 % | 9.9(4) MeV | AL |
| Rg-282 | 100 s | α → 278Mt SF div | ca. 100 % ? | 9.550(104) MeV | AL |
| Rg-283 | 5.1 min | SF div | ? | ||
| Rg-284 | - unknown - | ||||
| Rg-285 | - unknown - | ||||
| Rg-286 | 11 min | α → 282Mt SF div | ca. 100 % ? | 8.630(100) MeV | |
Notes (related to the columns):
1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Roentgenium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
7 - isotope notation in short form.
8 - decay: half-live of the Roentgenium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).
Miscellaneous:
()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
- unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.
Properties of the Roentgenium nucleides
[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.
[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.
[3] - Live Chart of Nuclides. Nuclear structure and decay data.
Roentgenium: NMR properties
[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.
[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.
[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.
[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).
More sources:
[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.
Last update: 2022-12-12
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