Molybdenum-89

Properties and data of the isotope ⁸⁹Mo.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Molybdenum-89; Mo-89Symbol:⁸⁹Mo or 8942MoMass number A:89 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:47Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1190476190476 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:88.919468(4) u (atomic weight of Molybdenum-89)Nuclide mass:88.8964287 u (calculated nuclear mass without electrons)Mass excess:-75.01507 MeVMass defect:0.81643439600001 u (per nucleus)Nuclear binding energy:760.50374127 MeV (per nucleus)
8.54498586 MeV (average binding energy per nucleon)Separation energy:S_N = 10.400(5) MeV (first neutron)
S_P = 6.13(6) MeV (first proton)Half-life:2.11(10) minDecay constant λ:0.0054750962129538 s^-1Specific activity α:3.746795524558 × 10⁺¹⁹ Bq g^-1
1012647439.0698 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Year of discovery:1980

Radioactive Decay

Half-life T_½ = 2.11(10) min (minutes) respectively 1.266 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁹Nb	100 %	5.610(24) MeV

Parent Nuclides

Direct parent isotope is: ⁸⁹Tc.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^89mMo	387.5(2) keV	190(15) ms	(1/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 89) with Molybdenum-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 47	Isobar A = 89
26	⁷³Fe
27	⁷⁴Co
28	⁷⁵Ni
29	⁷⁶Cu
30	⁷⁷Zn
31	⁷⁸Ga
32	⁷⁹Ge	⁸⁹Ge
33	⁸⁰As	⁸⁹As
34	⁸¹Se	⁸⁹Se
35	⁸²Br	⁸⁹Br
36	⁸³Kr	⁸⁹Kr
37	⁸⁴Rb	⁸⁹Rb
38	⁸⁵Sr	⁸⁹Sr
39	⁸⁶Y	⁸⁹Y
40	⁸⁷Zr	⁸⁹Zr
41	⁸⁸Nb	⁸⁹Nb
42	⁸⁹Mo	⁸⁹Mo
43	⁹⁰Tc	⁸⁹Tc
44	⁹¹Ru	⁸⁹Ru
45	⁹²Rh	⁸⁹Rh
46	⁹³Pd
47	⁹⁴Ag
48	⁹⁵Cd
49	⁹⁶In