Holmium-168m
Properties and data of the isotope 168Ho.
See also: list of Holmium isotopes.
General data
Name of the isotope:Holmium-168m; Ho-168mSymbol:168Ho or 16867HoMass number A:168 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:101Isotopic mass:167.93552(3) u (atomic weight of Holmium-168m)
Excitation energy: 59 keVNuclide mass:167.8987683 u (calculated nuclear mass without electrons)Mass excess:-60.06273 MeVMass defect:1.46391366 u (per nucleus)Nuclear binding energy:1363.62679081 MeV (per nucleus)
8.11682614 MeV (average binding energy per nucleon)Half-life:132(4) sDecay constant λ:0.005251115004242 s-1Specific activity α:1.893590073489 × 10+19 Bq g-1
511781100.94308 Ci g-1Spin and parity:
(nuclear angular momentum)(6+)
Radioactive Decay
Half-life T½ = 132(4) s respectively 1.32 × 102 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 168Er | ≤ 0.5 % | | |
Iso | 168Ho | ≥ 99.5 % | | |
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 |
---|
168Ho | | 2.99(7) min | 3+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 168) with Holmium-168m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 101 | Isobar A = 168 |
59 | 160Pr | |
60 | 161Nd | |
61 | 162Pm | |
62 | 163Sm | |
63 | 164Eu | 168Eu |
64 | 165Gd | 168Gd |
65 | 166Tb | 168Tb |
66 | 167Dy | 168Dy |
67 | 168Ho | 168Ho |
68 | 169Er | 168Er |
69 | 170Tm | 168Tm |
70 | 171Yb | 168Yb |
71 | 172Lu | 168Lu |
72 | 173Hf | 168Hf |
73 | 174Ta | 168Ta |
74 | 175W | 168W |
75 | 176Re | 168Re |
76 | 177Os | 168Os |
77 | 178Ir | 168Ir |
78 | 179Pt | 168Pt |
79 | 180Au | |
80 | 181Hg | |
81 | 182Tl | |
82 | 183Pb | |
83 | 184Bi | |
Last update: 2020-10-09
Perma link: https://www.chemlin.org/isotope/holmium-168m
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