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:1.102052136379 × 10+21 Bq g-1 29785192875.122 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.
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.
