Lead-220

Properties and data of the isotope ²²⁰Pb.

Contents

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

General data

Name of the isotope:Lead-220; Pb-220Symbol:²²⁰Pb or 22082PbMass number A:220 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:138Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6829268292683 (= neutron-proton ratio)Neutron excess (N-Z):56Isotopic mass:220.02541(43) u (atomic weight of Lead-220)Nuclide mass:219.9804316 u (calculated nuclear mass without electrons)Mass excess:23.66926 MeVMass defect:1.812001032 u (per nucleus)Nuclear binding energy:1687.8680893 MeV (per nucleus)
7.67212768 MeV (average binding energy per nucleon)Separation energy:S_N = 4.68(57) MeV (first neutron)Half-life:> 300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.324590845454 × 10⁺²⁷ Bq g^-1
1.709348877149 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2010

Radioactive Decay

Half-life T_½ = > 300 ns respectively 3.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²²⁰Bi	?	2.85(50) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 138) and isobaric (same nucleon number A = 220) with Lead-220. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 138	Isobar A = 220
82	²²⁰Pb	²²⁰Pb
83	²²¹Bi	²²⁰Bi
84	²²²Po	²²⁰Po
85	²²³At	²²⁰At
86	²²⁴Rn	²²⁰Rn
87	²²⁵Fr	²²⁰Fr
88	²²⁶Ra	²²⁰Ra
89	²²⁷Ac	²²⁰Ac
90	²²⁸Th	²²⁰Th
91	²²⁹Pa	²²⁰Pa
92	²³⁰U	²²⁰U
93	²³¹Np	²²⁰Np
94	²³²Pu
95	²³³Am
96	²³⁴Cm
97	²³⁵Bk