Astatine-196
Properties and data of the isotope 196At.
See also: list of Astatine isotopes.
General data
Name of the isotope:Astatine-196; At-196Symbol:196At or 19685AtMass number A:196 (= number of nucleons)Atomic number Z:85 (= number of protons)Neutrons N:111Isotopic mass:195.99580(3) u (atomic weight of Astatine-196)Nuclide mass:195.9491763 u (calculated nuclear mass without electrons)Mass excess:-3.91227 MeVMass defect:1.631133396 u (per nucleus)Nuclear binding energy:1519.39097157 MeV (per nucleus)
7.75199475 MeV (average binding energy per nucleon)Separation energy:SN = 8.52(3) MeV (first neutron)
SP = 0.15(5) MeV (first proton)Half-life:388(7) msDecay constant λ:1.7864618055669 s-1Specific activity α:5.51708955590 × 10+21 Bq g-1
149110528538.05 Ci g-1Spin and parity:
(nuclear angular momentum)(3+)Year of discovery:1967
Radioactive Decay
Half-life T½ = 388(7) ms respectively 3.88 × 10-1 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 192Bi | 95.1 % | 7.195(3) MeV | |
EE/β+ | 196Po | 4.9 % | 9.56(3) MeV | |
Parent Nuclides
Direct parent isotope is: 200Fr.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
196mAt | 157.9(1) keV | 11(2) μs | (5+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 196) with Astatine-196. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 111 | Isobar A = 196 |
70 | 181Yb | |
71 | 182Lu | |
72 | 183Hf | |
73 | 184Ta | |
74 | 185W | 196W |
75 | 186Re | 196Re |
76 | 187Os | 196Os |
77 | 188Ir | 196Ir |
78 | 189Pt | 196Pt |
79 | 190Au | 196Au |
80 | 191Hg | 196Hg |
81 | 192Tl | 196Tl |
82 | 193Pb | 196Pb |
83 | 194Bi | 196Bi |
84 | 195Po | 196Po |
85 | 196At | 196At |
86 | 197Rn | 196Rn |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/astatine-196
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