Molybdenum-84

Properties and data of the isotope ⁸⁴Mo.

Contents

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

General data

Name of the isotope:Molybdenum-84; Mo-84Symbol:⁸⁴Mo or 8442MoMass number A:84 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:42Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1 (= neutron-proton ratio)Neutron excess (N-Z):0Isotopic mass:83.94185(32) u (atomic weight of Molybdenum-84)Nuclide mass:83.9188107 u (calculated nuclear mass without electrons)Mass excess:-54.16638 MeVMass defect:0.75072781600001 u (per nucleus)Nuclear binding energy:699.29845624 MeV (per nucleus)
8.32498162 MeV (average binding energy per nucleon)Separation energy:S_N = 15.90(50) MeV (first neutron)
S_P = 3.90(33) MeV (first proton)Half-life:2.3(3) sDecay constant λ:0.30136833937389 s^-1Specific activity α:2.186605530644 × 10⁺²¹ Bq g^-1
59097446774.17 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Isobaric spin: 0Year of discovery:1991

Radioactive Decay

Half-life T_½ = 2.3(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁴Nb	100 %	7.05(30) MeV
ε, p	⁸³Zr	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 84) with Molybdenum-84. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 84
21	⁶³Sc
22	⁶⁴Ti
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe
27	⁶⁹Co
28	⁷⁰Ni
29	⁷¹Cu
30	⁷²Zn	⁸⁴Zn
31	⁷³Ga	⁸⁴Ga
32	⁷⁴Ge	⁸⁴Ge
33	⁷⁵As	⁸⁴As
34	⁷⁶Se	⁸⁴Se
35	⁷⁷Br	⁸⁴Br
36	⁷⁸Kr	⁸⁴Kr
37	⁷⁹Rb	⁸⁴Rb
38	⁸⁰Sr	⁸⁴Sr
39	⁸¹Y	⁸⁴Y
40	⁸²Zr	⁸⁴Zr
41	⁸³Nb	⁸⁴Nb
42	⁸⁴Mo	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru