Lutetium-172m2
Properties and data of the isotope 172m2Lu.
See also: List of individual Lutetium isotopes (and general data sources).
General data
Name of the isotope:Lutetium-172m2; Lu-172m2Symbol:172m2Lu or 172m271LuMass number A:172 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:101Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4225352112676 (= neutron-proton ratio)Neutron excess (N-Z):30Excitation energy:65.79(4) keVIsotopic mass:171.9390914(25) u (atomic weight of Lutetium-172m2)Nuclide mass:171.9001459 u (calculated nuclear mass without electrons)Mass excess:-56.736 MeVMass defect:1.491642388 u (per nucleus)Nuclear binding energy:1389.45593457 MeV (per nucleus)
8.07823218 MeV (average binding energy per nucleon)Half-life:0.332(20) μsDecay constant λ:2087792.71253 s-1Specific activity α:7.352620936377 × 10+27 Bq g-1
1.987194847669 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)(1)+
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 |
|---|
| 172Lu | | 6.70(3) d | 4- |
| 172m1Lu | 41.86(4) keV | 3.7(5) min | 1- |
| 172m3Lu | 109.41(10) keV | 440(12) μs | (1)+ |
| 172m4Lu | 213.57(17) keV | 150 ns | (6-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 172) with Lutetium-172m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 101 | Isobar A = 172 |
|---|
| 57 | 158La | |
| 58 | 159Ce | |
| 59 | 160Pr | |
| 60 | 161Nd | |
| 61 | 162Pm | |
| 62 | 163Sm | |
| 63 | 164Eu | |
| 64 | 165Gd | 172Gd |
| 65 | 166Tb | 172Tb |
| 66 | 167Dy | 172Dy |
| 67 | 168Ho | 172Ho |
| 68 | 169Er | 172Er |
| 69 | 170Tm | 172Tm |
| 70 | 171Yb | 172Yb |
| 71 | 172Lu | 172Lu |
| 72 | 173Hf | 172Hf |
| 73 | 174Ta | 172Ta |
| 74 | 175W | 172W |
| 75 | 176Re | 172Re |
| 76 | 177Os | 172Os |
| 77 | 178Ir | 172Ir |
| 78 | 179Pt | 172Pt |
| 79 | 180Au | 172Au |
| 80 | 181Hg | 172Hg |
| 81 | 182Tl | |
| 82 | 183Pb | |
| 83 | 184Bi | |
Last update: 2020-10-11
Perma link: https://www.chemlin.org/isotope/lutetium-172m2
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