Lead-202m2

Properties and data of the isotope ^202m2Pb.

Contents

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

General data

Name of the isotope:Lead-202m2; Pb-202m2Symbol:^202m2Pb or 202m282PbMass number A:202 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:120Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4634146341463 (= neutron-proton ratio)Neutron excess (N-Z):38Excitation energy:4091.0+x keVIsotopic mass:201.972152(4) u (atomic weight of Lead-202m2)Nuclide mass:201.9271736 u (calculated nuclear mass without electrons)Mass excess:-25.94024 MeVMass defect:1.709290544 u (per nucleus)Nuclear binding energy:1592.19388599 MeV (per nucleus)
7.88214795 MeV (average binding energy per nucleon)Half-life:110(5) nsDecay constant λ:6301338.0050904 s^-1Specific activity α:1.887937565807 × 10⁺²⁸ Bq g^-1
5.102533961641 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(16+)Magnetic dipole moment:μ(μ_N) = -0.67(15)Nuclear g-factor:g_l = -0.041875

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
²⁰²Pb		52.5(28) × 10³ a	0+
^202m1Pb	2169.85(8) keV	3.54(2) h	9-
^202m3Pb	5251.0+x keV	107(3) ns	(19-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 202) with Lead-202m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 120	Isobar A = 202
73	¹⁹³Ta
74	¹⁹⁴W
75	¹⁹⁵Re
76	¹⁹⁶Os	²⁰²Os
77	¹⁹⁷Ir	²⁰²Ir
78	¹⁹⁸Pt	²⁰²Pt
79	¹⁹⁹Au	²⁰²Au
80	²⁰⁰Hg	²⁰²Hg
81	²⁰¹Tl	²⁰²Tl
82	²⁰²Pb	²⁰²Pb
83	²⁰³Bi	²⁰²Bi
84	²⁰⁴Po	²⁰²Po
85	²⁰⁵At	²⁰²At
86	²⁰⁶Rn	²⁰²Rn
87	²⁰⁷Fr	²⁰²Fr
88	²⁰⁸Ra	²⁰²Ra
89	²⁰⁹Ac
90	²¹⁰Th