Thorium-216
Properties and data of the isotope 216Th.
See also: list of Thorium isotopes.
General data
Name of the isotope:Thorium-216; Th-216Symbol:216Th or 21690ThMass number A:216 (= number of nucleons)Atomic number Z:90 (= number of protons)Neutrons N:126Isotopic mass:216.011056(13) u (atomic weight of Thorium-216)Nuclide mass:215.9616902 u (calculated nuclear mass without electrons)Mass excess:10.2986 MeVMass defect:1.784976296 u (per nucleus)Nuclear binding energy:1662.69470987 MeV (per nucleus)
7.69766069 MeV (average binding energy per nucleon)Separation energy:SN = 8.695(15) MeV (first neutron)
SP = 3.021(17) MeV (first proton)Half-life:26.0(2) msDecay constant λ:26.659506944613 s-1Specific activity α:7.432745651709 × 10+22 Bq g-1
2008850176137.7 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1968
Radioactive Decay
Half-life T½ = 26.0(2) ms respectively 2.60 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 212Ra | ≤ 100 % | 8.072(4) MeV | |
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 |
---|
216m1Th | 2040(9) keV | 134(4) μs | 8+ |
216m2Th | 2646.8(1) keV | 0.58(3) μs | 11- |
216m3Th | 3681.4(7) keV | 0.74(7) μs | (14+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 126) and isobaric (same nucleon number A = 216) with Thorium-216. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 126 | Isobar A = 216 |
76 | 202Os | |
77 | 203Ir | |
78 | 204Pt | |
79 | 205Au | |
80 | 206Hg | 216Hg |
81 | 207Tl | 216Tl |
82 | 208Pb | 216Pb |
83 | 209Bi | 216Bi |
84 | 210Po | 216Po |
85 | 211At | 216At |
86 | 212Rn | 216Rn |
87 | 213Fr | 216Fr |
88 | 214Ra | 216Ra |
89 | 215Ac | 216Ac |
90 | 216Th | 216Th |
91 | 217Pa | 216Pa |
92 | 218U | 216U |
93 | 219Np | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/thorium-216
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