Ruthenium-85
Properties and data of the isotope 85Ru.
See also: list of Ruthenium isotopes.
General data
Name of the isotope:Ruthenium-85; Ru-85Symbol:85Ru or 8544RuMass number A:85 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:41Isotopic mass:84.96677(54) u (atomic weight of Ruthenium-85)Nuclide mass:84.9426337 u (calculated nuclear mass without electrons)Mass excess:-30.95355 MeVMass defect:0.732792964 u (per nucleus)Nuclear binding energy:682.59224921 MeV (per nucleus)
8.03049705 MeV (average binding energy per nucleon)Separation energy:SN = 0.54(64) MeV (first neutron)Half-life:450 nsDecay constant λ:1540327.067911 s-1Specific activity α:1.104293639682 × 10+28 Bq g-1
2.984577404547 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)Mirror nucleus:Niobium-85Year of discovery:2017
Radioactive Decay
Half-life T½ = 450 ns respectively 4.5 × 10-7 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE/β+ | 85Tc | ? | 14.9 MeV | |
| EE, p | 84Mo | ? | | |
| p | 84Tc | ? | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 41) and isobaric (same nucleon number A = 85) with Ruthenium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 41 | Isobar A = 85 |
|---|
| 22 | 63Ti | |
| 23 | 64V | |
| 24 | 65Cr | |
| 25 | 66Mn | |
| 26 | 67Fe | |
| 27 | 68Co | |
| 28 | 69Ni | |
| 29 | 70Cu | |
| 30 | 71Zn | 85Zn |
| 31 | 72Ga | 85Ga |
| 32 | 73Ge | 85Ge |
| 33 | 74As | 85As |
| 34 | 75Se | 85Se |
| 35 | 76Br | 85Br |
| 36 | 77Kr | 85Kr |
| 37 | 78Rb | 85Rb |
| 38 | 79Sr | 85Sr |
| 39 | 80Y | 85Y |
| 40 | 81Zr | 85Zr |
| 41 | 82Nb | 85Nb |
| 42 | 83Mo | 85Mo |
| 44 | 85Ru | 85Ru |
Literature and References
[1] - H. Suzuki et al.:
Discovery of new isotopes 81,82Mo and 85,86Ru and a determination of the particle instability of 103Sb.
In: Physical Review C, (2017), DOI 10.1103/PhysRevC.96.034604.
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/ruthenium-85
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