Thorium-211
Properties and data of the isotope 211Th.
See also: list of Thorium isotopes.
General data
Name of the isotope:Thorium-211; Th-211Symbol:211Th or 21190ThMass number A:211 (= number of nucleons)Atomic number Z:90 (= number of protons)Neutrons N:121Isotopic mass:211.01493(8) u (atomic weight of Thorium-211)Nuclide mass:210.9655642 u (calculated nuclear mass without electrons)Mass excess:13.90721 MeVMass defect:1.737777716 u (per nucleus)Nuclear binding energy:1618.72951579 MeV (per nucleus)
7.67170387 MeV (average binding energy per nucleon)Separation energy:SN = 8.22(8) MeV (first neutron)
SP = 2.17(9) MeV (first proton)Half-life:37 msDecay constant λ:18.733707582701 s-1Specific activity α:5.346778478288 × 10+22 Bq g-1
1445075264402.4 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:1995
Radioactive Decay
Half-life T½ = 37 ms respectively 3.7 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 207Ra | ? | 7.94(5) MeV | |
&epsilon | 211Ac | ? | 6.71(9) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 121) and isobaric (same nucleon number A = 211) with Thorium-211. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 121 | Isobar A = 211 |
73 | 194Ta | |
74 | 195W | |
75 | 196Re | |
76 | 197Os | |
77 | 198Ir | |
78 | 199Pt | |
79 | 200Au | |
80 | 201Hg | 211Hg |
81 | 202Tl | 211Tl |
82 | 203Pb | 211Pb |
83 | 204Bi | 211Bi |
84 | 205Po | 211Po |
85 | 206At | 211At |
86 | 207Rn | 211Rn |
87 | 208Fr | 211Fr |
88 | 209Ra | 211Ra |
89 | 210Ac | 211Ac |
90 | 211Th | 211Th |
91 | 212Pa | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/thorium-211
© 1996 - 2024 ChemLin