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Astatine-215

Properties and data of the isotope 215At.

 

See also: list of Astatine isotopes.

 

General data

Name of the isotope:Astatine-215; At-215Symbol:215AtMass number A:215Atomic number Z:85 (= number of protons)Neutrons N:130Isotopic mass:214.998652(7) u (atomic weight of Astatine-215)Nuclide mass:214.9520283 u (calculated nuclear mass without electrons)Mass excess:-1.25565 MeVMass defect:1.7929148 u (per nucleus)Nuclear binding energy:1670.08937871 MeV (per nucleus)
7.76785758 MeV (average binding energy per nucleon)
Separation energy:SN = 5.947(8) MeV (first neutron)
SP = 4.075(7) MeV (first proton)
Half-life:0.10(2) msDecay constant λ:6931.4718055995 s-1Spin and parity:9/2-Year of discovery:1944

 

Radioactive Decay

Half-life T½ = 0.10(2) ms respectively 1.0 × 10-4 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α211Bi100 %8,178(4) MeV

 

Astatine-215 decay chain

 

Parent Nuclides

Direct parent isotopes are: 219Fr, 215Po.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 130) and isobaric (same nucleon number A = 215) with Astatine-215. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 130Isobar A = 215
78208Pt
79209Au
80210Hg215Hg
81211Tl215Tl
82212Pb215Pb
83213Bi215Bi
84214Po215Po
85215At215At
86216Rn215Rn
87217Fr215Fr
88218Ra215Ra
89219Ac215Ac
90220Th215Th
91221Pa215Pa
92222U215U

 

External data and identifiers

CAS:15755-41-6InChI Key:RYXHOMYVWAEKHL-BKFZFHPZSA-NSMILES:[215At]PubChem:ID 44154536Adopted Levels, Gammas:NuDat 215At

 


Category: Isotopes

Last update: 26.11.2022



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