Molybdenum-99m1

Properties and data of the isotope ^99m1Mo.

Contents

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

General data

Name of the isotope:Molybdenum-99m1; Mo-99m1Symbol:^99m1Mo or 99m142MoMass number A:99 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:57Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3571428571429 (= neutron-proton ratio)Neutron excess (N-Z):15Excitation energy:97.785(3) keVIsotopic mass:98.90770730(24) u (atomic weight of Molybdenum-99m1)Nuclide mass:98.884668 u (calculated nuclear mass without electrons)Mass excess:-85.9701 MeVMass defect:0.91484425600001 u (per nucleus)Nuclear binding energy:852.1719354 MeV (per nucleus)
8.60779733 MeV (average binding energy per nucleon)Half-life:15.5(2) μsDecay constant λ:44719.172939351 s^-1Specific activity α:2.748011822251 × 10⁺²⁶ Bq g^-1
7.427058979058 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = 0.775(5)Nuclear g-factor:g_l = 0.31

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
⁹⁹Mo		65.924(6) h	1/2+
^99m2Mo	684.10(19) keV	0.76(6) μs	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 99) with Molybdenum-99m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 57	Isobar A = 99
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se
35	⁹²Br
36	⁹³Kr	⁹⁹Kr
37	⁹⁴Rb	⁹⁹Rb
38	⁹⁵Sr	⁹⁹Sr
39	⁹⁶Y	⁹⁹Y
40	⁹⁷Zr	⁹⁹Zr
41	⁹⁸Nb	⁹⁹Nb
42	⁹⁹Mo	⁹⁹Mo
43	¹⁰⁰Tc	⁹⁹Tc
44	¹⁰¹Ru	⁹⁹Ru
45	¹⁰²Rh	⁹⁹Rh
46	¹⁰³Pd	⁹⁹Pd
47	¹⁰⁴Ag	⁹⁹Ag
48	¹⁰⁵Cd	⁹⁹Cd
49	¹⁰⁶In	⁹⁹In
50	¹⁰⁷Sn	⁹⁹Sn
51	¹⁰⁸Sb
52	¹⁰⁹Te
53	¹¹⁰I
54	¹¹¹Xe
55	¹¹²Cs