Ruthenium-85

Properties and data of the isotope ⁸⁵Ru.

Content

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:S_N = 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 T_½ = 450 ns respectively 4.5 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy
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.

OZ	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