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Astatine-219

Properties and data of the isotope 219At.

 

See also: list of Astatine isotopes.

 

General data

Name of the isotope:Astatine-219; At-219Symbol:219AtMass number A:219Atomic number Z:85 (= number of protons)Neutrons N:134Isotopic mass:219.011161(3) u (atomic weight of Astatine-219)Nuclide mass:218.9645373 u (calculated nuclear mass without electrons)Mass excess:204007378407.35 MeVMass defect:-219010940.17377 u (per nucleus)Nuclear binding energy:-204007376706.23 MeV (per nucleus)
-931540532.90516 MeV (average binding energy per nucleon)
Separation energy:SN = 5.773(12) MeV (first neutron)
SP = 5.250(4) MeV (first proton)
Half-life:56(3) sDecay constant λ:0.012377628224285 s-1Spin and parity:(9/2-)Year of discovery:1953

 

Radioactive Decay

Half-life T½ = 56(3) s respectively 5.6 × 101 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α215Bi93,6(10) %6,342(5) MeV
β-219Rn6,4(10) %1,5667(29) MeV

 

Astatine-219 decay chain

 

Parent Nuclides

Direct parent isotope is: 223Fr.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 134) and isobaric (same nucleon number A = 219) with Astatine-219. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 134Isobar A = 219
80214Hg
81215Tl
82216Pb219Pb
83217Bi219Bi
84218Po219Po
85219At219At
86220Rn219Rn
87221Fr219Fr
88222Ra219Ra
89223Ac219Ac
90224Th219Th
91225Pa219Pa
92226U219U
93227Np219Np
94228Pu
95229Am

 

External data and identifiers

Adopted Levels, Gammas:NuDat 219At

 


Category: Isotopes

Last update: 26.11.2022



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