Polonium-211
Properties and data of the isotope 211Po.
See also: list of Polonium isotopes.
General data
Name of the isotope:Polonium-211; Po-211Other names:Actinium CSymbol:211Po or 21184PoMass number A:211 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:127Isotopic mass:210.9866531(13) u (atomic weight of Polonium-211)Nuclide mass:210.9405778 u (calculated nuclear mass without electrons)Mass excess:-12.43256 MeVMass defect:1.77109392 u (per nucleus)Nuclear binding energy:1649.76335992 MeV (per nucleus)
7.8187837 MeV (average binding energy per nucleon)Separation energy:SN = 4.5507(5) MeV (first neutron)
SP = 4.9296(9) MeV (first proton)Half-life:0.516(3) sDecay constant λ:1.3433084894573 s-1Specific activity α:3.852187115171 × 10+21 Bq g-1
104113165274.91 Ci g-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μN) = -1.197(85)Quadrupole moment Q:-0.77(8) barn (100 fm2)Nuclear g-factor:gl = -0.266Year of discovery:1913
Radioactive Decay
Half-life T½ = 0.516(3) s respectively 5.16 × 10-1 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 207Pb | 100 % | 7.5946(5) MeV | |
Parent Nuclides
Direct parent isotopes are: 215Rn, 211At, 211Bi.
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 |
---|
211m1Po | 1462(5) keV | 25.2(6) s | (25/2+) |
211m2Po | 2135(5) keV | 243(21) ns | (31/2-) |
211m3Po | 4872(6) keV | 2.8(7) μs | (43/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 211) with Polonium-211. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 127 | Isobar A = 211 |
76 | 203Os | |
77 | 204Ir | |
78 | 205Pt | |
79 | 206Au | |
80 | 207Hg | 211Hg |
81 | 208Tl | 211Tl |
82 | 209Pb | 211Pb |
83 | 210Bi | 211Bi |
84 | 211Po | 211Po |
85 | 212At | 211At |
86 | 213Rn | 211Rn |
87 | 214Fr | 211Fr |
88 | 215Ra | 211Ra |
89 | 216Ac | 211Ac |
90 | 217Th | 211Th |
91 | 218Pa | |
92 | 219U | |
External data and identifiers
CAS:15735-83-8InChI Key:HZEBHPIOVYHPMT-NJFSPNSNSA-NSMILES:[211Po]PubChem:ID 6337588Adopted Levels, Gammas:NuDat 211Po
Last update: 2021-03-08
Perma link: https://www.chemlin.org/isotope/polonium-211
© 1996 - 2024 ChemLin