Molybdenum-90

Properties and data of the isotope ⁹⁰Mo.

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-90; Mo-90Symbol:⁹⁰Mo or 9042MoMass number A:90 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:48Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1428571428571 (= neutron-proton ratio)Neutron excess (N-Z):6Isotopic mass:89.913931(4) u (atomic weight of Molybdenum-90)Nuclide mass:89.8908917 u (calculated nuclear mass without electrons)Mass excess:-80.17276 MeVMass defect:0.83063631200001 u (per nucleus)Nuclear binding energy:773.73274081 MeV (per nucleus)
8.59703045 MeV (average binding energy per nucleon)Separation energy:S_N = 13.229(5) MeV (first neutron)
S_P = 68.36(24) MeV (first proton)Half-life:5.56(9) hDecay constant λ:3.462965530375 × 10^-5 s^-1Specific activity α:2.343198451351 × 10⁺¹⁷ Bq g^-1
6332968.7874359 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1953

Radioactive Decay

Half-life T_½ = 5.56(9) h (hours) respectively 2.0016 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹⁰Nb	100 %	2.489(5) MeV

Parent Nuclides

Direct parent isotope is: ⁹⁰Tc.

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
^90mMo	2874.73(15) keV	1.12(5) μs	8+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 90) with Molybdenum-90. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 48	Isobar A = 90
26	⁷⁴Fe
27	⁷⁵Co
28	⁷⁶Ni
29	⁷⁷Cu
30	⁷⁸Zn
31	⁷⁹Ga
32	⁸⁰Ge	⁹⁰Ge
33	⁸¹As	⁹⁰As
34	⁸²Se	⁹⁰Se
35	⁸³Br	⁹⁰Br
36	⁸⁴Kr	⁹⁰Kr
37	⁸⁵Rb	⁹⁰Rb
38	⁸⁶Sr	⁹⁰Sr
39	⁸⁷Y	⁹⁰Y
40	⁸⁸Zr	⁹⁰Zr
41	⁸⁹Nb	⁹⁰Nb
42	⁹⁰Mo	⁹⁰Mo
43	⁹¹Tc	⁹⁰Tc
44	⁹²Ru	⁹⁰Ru
45	⁹³Rh	⁹⁰Rh
46	⁹⁴Pd	⁹⁰Pd
47	⁹⁵Ag
48	⁹⁶Cd
49	⁹⁷In
50	⁹⁸Sn