Lead-200

Properties and data of the isotope ²⁰⁰Pb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Lead-200; Pb-200Symbol:²⁰⁰Pb or 20082PbMass number A:200 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:118Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4390243902439 (= neutron-proton ratio)Neutron excess (N-Z):36Isotopic mass:199.971818(12) u (atomic weight of Lead-200)Nuclide mass:199.9268396 u (calculated nuclear mass without electrons)Mass excess:-26.25136 MeVMass defect:1.692294712 u (per nucleus)Nuclear binding energy:1576.36237046 MeV (per nucleus)
7.88181185 MeV (average binding energy per nucleon)Separation energy:S_N = 9.091(15) MeV (first neutron)
S_P = 5.48(3) MeV (first proton)Half-life:21.5(4) hDecay constant λ:8.955389929715 × 10^-6 s^-1Specific activity α:2.710081387557 × 10⁺¹⁶ Bq g^-1
732454.4290697 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4611(20) femtometer fmYear of discovery:1950

Radioactive Decay

Half-life T_½ = 21.5(4) h (hours) respectively 7.7400 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	²⁰⁰Tl	100 %	0.796(12) MeV

Parent Nuclides

Direct parent isotopes are: ²⁰⁰Bi, ²⁰⁴Po.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 118) and isobaric (same nucleon number A = 200) with Lead-200. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 118	Isobar A = 200
72	¹⁹⁰Hf
73	¹⁹¹Ta
74	¹⁹²W
75	¹⁹³Re
76	¹⁹⁴Os	²⁰⁰Os
77	¹⁹⁵Ir	²⁰⁰Ir
78	¹⁹⁶Pt	²⁰⁰Pt
79	¹⁹⁷Au	²⁰⁰Au
80	¹⁹⁸Hg	²⁰⁰Hg
81	¹⁹⁹Tl	²⁰⁰Tl
82	²⁰⁰Pb	²⁰⁰Pb
83	²⁰¹Bi	²⁰⁰Bi
84	²⁰²Po	²⁰⁰Po
85	²⁰³At	²⁰⁰At
86	²⁰⁴Rn	²⁰⁰Rn
87	²⁰⁵Fr	²⁰⁰Fr
88	²⁰⁶Ra
89	²⁰⁷Ac
90	²⁰⁸Th