Erbium-167m
Properties and data of the isotope 167mEr.
See also: List of individual Erbium isotopes (and general data sources).
General data
Name of the isotope:Erbium-167m; Er-167mSymbol:167mEr or 167m68ErMass number A:167 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:99Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4558823529412 (= neutron-proton ratio)Neutron excess (N-Z):31Excitation energy:207.801(5) keVIsotopic mass:166.93205(2) u (atomic weight of Erbium-167m)Nuclide mass:166.8947499 u (calculated nuclear mass without electrons)Mass excess:-63.29502 MeVMass defect:1.45787886 u (per nucleus)Nuclear binding energy:1358.00541082 MeV (per nucleus)
8.13176893 MeV (average binding energy per nucleon)Half-life:2.269(6) sDecay constant λ:0.30548575608636 s-1Specific activity α:1.108239911961 × 10+21 Bq g-1
29952430053.016 Ci g-1Spin and parity:
(nuclear angular momentum)1/2-
Radioactive Decay
Half-life T½ = 2.269(6) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| Iso | 167Er | 100 % | | |
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 |
|---|
| 167Er | | stable | 7/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 167) with Erbium-167m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 99 | Isobar A = 167 |
|---|
| 56 | 155Ba | |
| 57 | 156La | |
| 58 | 157Ce | |
| 59 | 158Pr | |
| 60 | 159Nd | |
| 61 | 160Pm | |
| 62 | 161Sm | |
| 63 | 162Eu | 167Eu |
| 64 | 163Gd | 167Gd |
| 65 | 164Tb | 167Tb |
| 66 | 165Dy | 167Dy |
| 67 | 166Ho | 167Ho |
| 68 | 167Er | 167Er |
| 69 | 168Tm | 167Tm |
| 70 | 169Yb | 167Yb |
| 71 | 170Lu | 167Lu |
| 72 | 171Hf | 167Hf |
| 73 | 172Ta | 167Ta |
| 74 | 173W | 167W |
| 75 | 174Re | 167Re |
| 76 | 175Os | 167Os |
| 77 | 176Ir | 167Ir |
| 78 | 177Pt | 167Pt |
| 79 | 178Au | |
| 80 | 179Hg | |
| 81 | 180Tl | |
| 82 | 181Pb | |
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/erbium-167m
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