Molybdenum-85

Properties and data of the isotope ⁸⁵Mo.

Contents

See also: List of individual Molybdenum isotopes (and general data sources).

General data

Name of the isotope:Molybdenum-85; Mo-85Symbol:⁸⁵Mo or 8542MoMass number A:85 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:43Isotopic mass:84.938261(17) u (atomic weight of Molybdenum-85)Nuclide mass:84.9152217 u (calculated nuclear mass without electrons)Mass excess:-57.50951 MeVMass defect:0.762981732 u (per nucleus)Nuclear binding energy:710.71290547 MeV (per nucleus)
8.3613283 MeV (average binding energy per nucleon)Separation energy:S_N = 11.41(30) MeV (first neutron)
S_P = 3.580(21) MeV (first proton)Half-life:3.2(2) sDecay constant λ:0.21660849392498 s^-1Specific activity α:1.552912930803 × 10⁺²¹ Bq g^-1
41970619751.449 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)Mirror nucleus:Technetium-85Year of discovery:1992

Radioactive Decay

Half-life T_½ = 3.2(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁵Nb		8.77(16) MeV
EC, p	⁸⁴Zr	0.14(2) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 85) with Molybdenum-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 85
22	⁶⁵Ti
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn
26	⁶⁹Fe
27	⁷⁰Co
28	⁷¹Ni
29	⁷²Cu
30	⁷³Zn	⁸⁵Zn
31	⁷⁴Ga	⁸⁵Ga
32	⁷⁵Ge	⁸⁵Ge
33	⁷⁶As	⁸⁵As
34	⁷⁷Se	⁸⁵Se
35	⁷⁸Br	⁸⁵Br
36	⁷⁹Kr	⁸⁵Kr
37	⁸⁰Rb	⁸⁵Rb
38	⁸¹Sr	⁸⁵Sr
39	⁸²Y	⁸⁵Y
40	⁸³Zr	⁸⁵Zr
41	⁸⁴Nb	⁸⁵Nb
42	⁸⁵Mo	⁸⁵Mo
43	⁸⁶Tc	⁸⁵Tc
44	⁸⁷Ru	⁸⁵Ru