Lead-219

Properties and data of the isotope ²¹⁹Pb.

Contents

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

General data

Name of the isotope:Lead-219; Pb-219Symbol:²¹⁹Pb or 21982PbMass number A:219 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:137Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.6707317073171 (= neutron-proton ratio)Neutron excess (N-Z):55Isotopic mass:219.02177(43) u (atomic weight of Lead-219)Nuclide mass:218.9767916 u (calculated nuclear mass without electrons)Mass excess:20.27862 MeVMass defect:1.806976116 u (per nucleus)Nuclear binding energy:1683.1874102 MeV (per nucleus)
7.68578726 MeV (average binding energy per nucleon)Separation energy:S_N = 3.25(50) MeV (first neutron)
S_P = 10.19(57) MeV (first proton)Half-life:> 300 nsDecay constant λ:2310490.6018665 s^-1Specific activity α:6.353470255707 × 10⁺²⁷ Bq g^-1
1.717154123164 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2009

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^-	²¹⁹Bi	?	4.00(45) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 137) and isobaric (same nucleon number A = 219) with Lead-219. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 137	Isobar A = 219
82	²¹⁹Pb	²¹⁹Pb
83	²²⁰Bi	²¹⁹Bi
84	²²¹Po	²¹⁹Po
85	²²²At	²¹⁹At
86	²²³Rn	²¹⁹Rn
87	²²⁴Fr	²¹⁹Fr
88	²²⁵Ra	²¹⁹Ra
89	²²⁶Ac	²¹⁹Ac
90	²²⁷Th	²¹⁹Th
91	²²⁸Pa	²¹⁹Pa
92	²²⁹U	²¹⁹U
93	²³⁰Np	²¹⁹Np
94	²³¹Pu
95	²³²Am
96	²³³Cm
97	²³⁴Bk