Gold-179
Properties and data of the isotope 179Au.
See also: list of Gold isotopes.
General data
Name of the isotope:Gold-179; Au-179Symbol:179Au or 17979AuMass number A:179 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:100Isotopic mass:178.973174(13) u (atomic weight of Gold-179)Nuclide mass:178.9298409 u (calculated nuclear mass without electrons)Mass excess:-24.98826 MeVMass defect:1.511495128 u (per nucleus)Nuclear binding energy:1407.94864276 MeV (per nucleus)
7.86563488 MeV (average binding energy per nucleon)Separation energy:SN = 10.756(15) MeV (first neutron)
SP = 0.280(15) MeV (first proton)Half-life:7.1(3) sDecay constant λ:0.097626363459147 s-1Specific activity α:3.302919732552 × 10+20 Bq g-1
8926810087.98 Ci g-1Spin and parity:
(nuclear angular momentum)(1/2+.3/2+)Year of discovery:1968
Radioactive Decay
Half-life T½ = 7.1(3) s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 175Ir | 22.0(9) % | 5.981(5) MeV | |
| EE/β+ | 179Pt | 78.0(9) % | 7.280(14) MeV | |
Parent Nuclides
Direct parent isotope is: 183Tl.
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 |
|---|
| 179mAu | +x keV | 100 μs | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 179) with Gold-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 100 | Isobar A = 179 |
|---|
| 59 | 159Pr | |
| 60 | 160Nd | |
| 61 | 161Pm | |
| 62 | 162Sm | |
| 63 | 163Eu | |
| 64 | 164Gd | |
| 65 | 165Tb | |
| 66 | 166Dy | |
| 67 | 167Ho | |
| 68 | 168Er | |
| 69 | 169Tm | 179Tm |
| 70 | 170Yb | 179Yb |
| 71 | 171Lu | 179Lu |
| 72 | 172Hf | 179Hf |
| 73 | 173Ta | 179Ta |
| 74 | 174W | 179W |
| 75 | 175Re | 179Re |
| 76 | 176Os | 179Os |
| 77 | 177Ir | 179Ir |
| 78 | 178Pt | 179Pt |
| 79 | 179Au | 179Au |
| 80 | 180Hg | 179Hg |
| 81 | 181Tl | 179Tl |
| 82 | 182Pb | 179Pb |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/gold-179
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