Silver-99
Properties and data of the isotope 99Ag.
See also: list of Silver isotopes.
General data
Name of the isotope:Silver-99; Ag-99Symbol:99Ag or 9947AgMass number A:99 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:52Isotopic mass:98.917646(7) u (atomic weight of Silver-99)Nuclide mass:98.8918641 u (calculated nuclear mass without electrons)Mass excess:-76.71226 MeVMass defect:0.900706136 u (per nucleus)Nuclear binding energy:839.00236145 MeV (per nucleus)
8.47477133 MeV (average binding energy per nucleon)Separation energy:SN = 11.72(3) MeV (first neutron)
SP = 2.680(8) MeV (first proton)Half-life:124(3) sDecay constant λ:0.0055898966174189 s-1Specific activity α:3.435014777814 × 10+19 Bq g-1
928382372.38227 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2+)Magnetic dipole moment:μ(μN) = +5.81(3)Nuclear g-factor:gl = 1.2911111111111Year of discovery:1967
Radioactive Decay
Half-life T½ = 124(3) s respectively 1.24 × 102 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE/β+ | 99Pd | 100 % | 5.470(8) 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 |
|---|
| 99mAg | 506.2(4) keV | 10.5(5) s | (1/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 52) and isobaric (same nucleon number A = 99) with Silver-99. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 52 | Isobar A = 99 |
|---|
| 28 | 80Ni | |
| 29 | 81Cu | |
| 30 | 82Zn | |
| 31 | 83Ga | |
| 32 | 84Ge | |
| 33 | 85As | |
| 34 | 86Se | |
| 35 | 87Br | |
| 36 | 88Kr | 99Kr |
| 37 | 89Rb | 99Rb |
| 38 | 90Sr | 99Sr |
| 39 | 91Y | 99Y |
| 40 | 92Zr | 99Zr |
| 41 | 93Nb | 99Nb |
| 42 | 94Mo | 99Mo |
| 43 | 95Tc | 99Tc |
| 44 | 96Ru | 99Ru |
| 45 | 97Rh | 99Rh |
| 46 | 98Pd | 99Pd |
| 47 | 99Ag | 99Ag |
| 48 | 100Cd | 99Cd |
| 49 | 101In | 99In |
| 50 | 102Sn | 99Sn |
| 51 | 103Sb | |
External data and identifiers
Last update: 2020-10-16
Perma link: https://www.chemlin.org/isotope/silver-99
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