Lead-190m2

Properties and data of the isotope ^190m2Pb.

Contents

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

General data

Name of the isotope:Lead-190m2; Pb-190m2Symbol:^190m2Pb or 190m282PbMass number A:190 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3170731707317 (= neutron-proton ratio)Neutron excess (N-Z):26Excitation energy:2616+x keVIsotopic mass:189.978082(13) u (atomic weight of Lead-190m2)Nuclide mass:189.9331036 u (calculated nuclear mass without electrons)Mass excess:-20.41649 MeVMass defect:1.599381552 u (per nucleus)Nuclear binding energy:1489.8143194 MeV (per nucleus)
7.841128 MeV (average binding energy per nucleon)Half-life:25 μsDecay constant λ:27725.887222398 s^-1Specific activity α:8.834349117460 × 10⁺²⁵ Bq g^-1
2.387661923637 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)(12+)

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
¹⁹⁰Pb		71(1) s	0+
^190m1Pb	2614.8(8) keV	150 ns	(10)+
^190m3Pb	2658.2(8) keV	7.2(6) μs	(11)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 190) with Lead-190m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 190
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb
71	¹⁷⁹Lu
72	¹⁸⁰Hf	¹⁹⁰Hf
73	¹⁸¹Ta	¹⁹⁰Ta
74	¹⁸²W	¹⁹⁰W
75	¹⁸³Re	¹⁹⁰Re
76	¹⁸⁴Os	¹⁹⁰Os
77	¹⁸⁵Ir	¹⁹⁰Ir
78	¹⁸⁶Pt	¹⁹⁰Pt
79	¹⁸⁷Au	¹⁹⁰Au
80	¹⁸⁸Hg	¹⁹⁰Hg
81	¹⁸⁹Tl	¹⁹⁰Tl
82	¹⁹⁰Pb	¹⁹⁰Pb
83	¹⁹¹Bi	¹⁹⁰Bi
84	¹⁹²Po	¹⁹⁰Po
85	¹⁹³At	¹⁹⁰At
86	¹⁹⁴Rn