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Isotopes of ytterbium

Most stable isotopes of ytterbium
iso NA half-life DM DE (MeV) DP
166Yb syn 56.7 h ε 0.304 166Tm
168Yb 0.126% is stable with 98 neutrons
169Yb syn 32.026 d ε 0.909 169Tm
170Yb 3.023% is stable with 100 neutrons
171Yb 14.216% is stable with 101 neutrons
172Yb 21.754% is stable with 102 neutrons
173Yb 16.098% is stable with 103 neutrons
174Yb 31.896% is stable with 104 neutrons
175Yb syn 4.185 d β 0.470 175Lu
176Yb 12.887% is stable with 106 neutrons
177Yb syn 1.911 h β 1.399 177Lu
Standard atomic weight (Ar)
  • 173.045(10)

Naturally occurring Ytterbium (70Yb) is composed of 7 stable isotopes, 168Yb, 170Yb, 171Yb, 172Yb, 173Yb, 174Yb, and 176Yb, with 174Yb being the most abundant (31.83% natural abundance). Twenty-seven radioisotopes have been characterized, with the most stable being 169Yb with a half-life of 32.026 days, 175Yb with a half-life of 4.185 days, and 166Yb with a half-life of 56.7 hours. All of the remaining radioactive isotopes have half-lives that are less than 2 hours, and the majority of these have half-lives that are less than 20 minutes. This element also has 12 meta states, with the most stable being 169mYb (t1/2 46 seconds).

The isotopes of ytterbium range in atomic weight from 147.967 u (148Yb) to 180.9562 u (181Yb). The primary decay mode before the most abundant stable isotope, 174Yb is electron capture, and the primary mode after is beta emission. The primary decay products before 174Yb are isotopes of thulium, and the primary products after are isotopes of lutetium. Of interest to modern quantum optics, the different ytterbium isotopes follow either Bose–Einstein statistics or Fermi–Dirac statistics, leading to interesting behavior in optical lattices.


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