Molybdenum-109

Properties and data of the isotope ¹⁰⁹Mo.

Contents

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

General data

Name of the isotope:Molybdenum-109; Mo-109Symbol:¹⁰⁹Mo or 10942MoMass number A:109 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:67Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5952380952381 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:108.928431(12) u (atomic weight of Molybdenum-109)Nuclide mass:108.9053917 u (calculated nuclear mass without electrons)Mass excess:-66.66609 MeVMass defect:0.98076971600001 u (per nucleus)Nuclear binding energy:913.58110584 MeV (per nucleus)
8.38147804 MeV (average binding energy per nucleon)Separation energy:S_N = 3.981(14) MeV (first neutron)
S_P = 14.409(14) MeV (first proton)Half-life:0.61 sDecay constant λ:1.136306853377 s^-1Specific activity α:6.336111047358 × 10⁺²¹ Bq g^-1
171246244523.21 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1992

Radioactive Decay

Half-life T_½ = 0.61 s respectively 6.1 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁹Tc	98.7 %	7.617(15) MeV
β^-, n	¹⁰⁸Tc	1.3(6) %	1.185(14) MeV

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
^109mMo	69.7(5) keV	0.194 μs	(1/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 109) with Molybdenum-109. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 67	Isobar A = 109
38	¹⁰⁵Sr
39	¹⁰⁶Y	¹⁰⁹Y
40	¹⁰⁷Zr	¹⁰⁹Zr
41	¹⁰⁸Nb	¹⁰⁹Nb
42	¹⁰⁹Mo	¹⁰⁹Mo
43	¹¹⁰Tc	¹⁰⁹Tc
44	¹¹¹Ru	¹⁰⁹Ru
45	¹¹²Rh	¹⁰⁹Rh
46	¹¹³Pd	¹⁰⁹Pd
47	¹¹⁴Ag	¹⁰⁹Ag
48	¹¹⁵Cd	¹⁰⁹Cd
49	¹¹⁶In	¹⁰⁹In
50	¹¹⁷Sn	¹⁰⁹Sn
51	¹¹⁸Sb	¹⁰⁹Sb
52	¹¹⁹Te	¹⁰⁹Te
53	¹²⁰I	¹⁰⁹I
54	¹²¹Xe	¹⁰⁹Xe
55	¹²²Cs
56	¹²³Ba
57	¹²⁴La
58	¹²⁵Ce
59	¹²⁶Pr
60	¹²⁷Nd
61	¹²⁸Pm
62	¹²⁹Sm
63	¹³⁰Eu