Gold-198m2
Properties and data of the isotope 198Au.
See also: list of Gold isotopes.
General data
Name of the isotope:Gold-198m2; Gold-198m2Symbol:198Au or 19879AuMass number A:198 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:119Isotopic mass:197.9682437(6) u (atomic weight of Gold-198m2)
Excitation energy: 811.7(15) keVNuclide mass:197.9249106 u (calculated nuclear mass without electrons)Mass excess:-29.5808 MeVMass defect:1.681058832 u (per nucleus)Nuclear binding energy:1565.89621566 MeV (per nucleus)
7.90856675 MeV (average binding energy per nucleon)Half-life:2.272(16) dDecay constant λ:3.531046132058 × 10-6 s-1Specific activity α:1.07941407056 × 10+16 Bq g-1
291733.53258595 Ci g-1Spin and parity:
(nuclear angular momentum)(12-)Magnetic dipole moment:μ(μN) = (+) 5.85(9)
Radioactive Decay
Half-life T½ = 2.272(16) d respectively 1.963008 × 105 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 198Au | 100 % | 0.8119(15) MeV | |
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 |
---|
198Au | | 2.6941(2) d | 2- |
198m1Au | 312.2227(20) keV | 124(4) ns | 5+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 119) and isobaric (same nucleon number A = 198) with Gold-198m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 119 | Isobar A = 198 |
73 | 192Ta | |
74 | 193W | |
75 | 194Re | 198Re |
76 | 195Os | 198Os |
77 | 196Ir | 198Ir |
78 | 197Pt | 198Pt |
79 | 198Au | 198Au |
80 | 199Hg | 198Hg |
81 | 200Tl | 198Tl |
82 | 201Pb | 198Pb |
83 | 202Bi | 198Bi |
84 | 203Po | 198Po |
85 | 204At | 198At |
86 | 205Rn | 198Rn |
87 | 206Fr | |
88 | 207Ra | |
89 | 208Ac | |
90 | 209Th | |
Last update: 2023-05-19
Perma link: https://www.chemlin.org/isotope/gold-198m2
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