Niobium-85

Properties and data of the isotope ⁸⁵Nb.

Contents

General data

Name of the isotope:Niobium-85; Nb-85Symbol:⁸⁵Nb or 8541NbMass number A:85 (= number of nucleons)Atomic number Z:41 (= number of protons)Neutrons N:44Isotopic mass:84.928846(4) u (atomic weight of Niobium-85)Nuclide mass:84.9063552 u (calculated nuclear mass without electrons)Mass excess:-66.27952 MeVMass defect:0.77323661600002 u (per nucleus)Nuclear binding energy:720.26526838 MeV (per nucleus)
8.47370904 MeV (average binding energy per nucleon)Separation energy:S_N = 13.132(14) MeV (first neutron)
S_P = 2.147(7) MeV (first proton)Half-life:20.9(7) sDecay constant λ:0.033164936868897 s^-1Specific activity α:2.377665731373 × 10⁺²⁰ Bq g^-1
6426123598.3078 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Mirror nucleus:Ruthenium-85Year of discovery:1988

Radioactive Decay

Half-life T_½ = 20.9(7) s respectively 2.09 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁵Zr	100 %	6.896(8) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 85) with Niobium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 44	Isobar A = 85
23	⁶⁷V
24	⁶⁸Cr
25	⁶⁹Mn
26	⁷⁰Fe
27	⁷¹Co
28	⁷²Ni
29	⁷³Cu
30	⁷⁴Zn	⁸⁵Zn
31	⁷⁵Ga	⁸⁵Ga
32	⁷⁶Ge	⁸⁵Ge
33	⁷⁷As	⁸⁵As
34	⁷⁸Se	⁸⁵Se
35	⁷⁹Br	⁸⁵Br
36	⁸⁰Kr	⁸⁵Kr
37	⁸¹Rb	⁸⁵Rb
38	⁸²Sr	⁸⁵Sr
39	⁸³Y	⁸⁵Y
40	⁸⁴Zr	⁸⁵Zr
41	⁸⁵Nb	⁸⁵Nb
42	⁸⁶Mo	⁸⁵Mo
43	⁸⁷Tc	⁸⁵Tc
44	⁸⁸Ru	⁸⁵Ru
45	⁸⁹Rh
46	⁹⁰Pd