Actinium-213
Properties and data of the isotope 213Ac.
Actinium-213 is a radioisotope of the chemical element actinium, which, in addition to element-specific 89 protons, has 124 neutrons in the atomic nucleus, resulting in the mass number 213. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with 213Ac is for academic purposes only.
See also: list of Actinium isotopes.
General data
Name of the isotope:Actinium-213; Ac-213Symbol:213Ac or 21389AcMass number A:213 (= number of nucleons)Atomic number Z:89 (= number of protons)Neutrons N:124Isotopic mass:213.006607(16) u (atomic weight of Actinium-213)Nuclide mass:212.9577896 u (calculated nuclear mass without electrons)Mass excess:6.15438 MeVMass defect:1.764270432 u (per nucleus)Nuclear binding energy:1643.40732179 MeV (per nucleus)
7.71552733 MeV (average binding energy per nucleon)Separation energy:SN = 9.19(5) MeV (first neutron)
SP = 0.935(19) MeV (first proton)Half-life:738(16) msDecay constant λ:0.93922382189694 s-1Specific activity α:2.655463922287 × 10+21 Bq g-1
71769295196.949 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2-)Magnetic dipole moment:μ(μN) = +4.2(4)Nuclear g-factor:gl = 0.93333333333333Year of discovery:1968
Radioactive Decay
Half-life T½ = 738(16) ms respectively 7.38 × 10-1 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 209Fr | > 99 % | 7.499(4) MeV | |
| &spsilon; | 213Ra | << 1 % | ? | |
Parent Nuclides
Direct parent isotopes are: 217Pa, 213Th.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 213) with Actinium-213. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 124 | Isobar A = 213 |
|---|
| 75 | 199Re | |
| 76 | 200Os | |
| 77 | 201Ir | |
| 78 | 202Pt | |
| 79 | 203Au | |
| 80 | 204Hg | 213Hg |
| 81 | 205Tl | 213Tl |
| 82 | 206Pb | 213Pb |
| 83 | 207Bi | 213Bi |
| 84 | 208Po | 213Po |
| 85 | 209At | 213At |
| 86 | 210Rn | 213Rn |
| 87 | 211Fr | 213Fr |
| 88 | 212Ra | 213Ra |
| 89 | 213Ac | 213Ac |
| 90 | 214Th | 213Th |
| 91 | 215Pa | 213Pa |
| 92 | 216U | |
External data and identifiers
Last update: 2022-12-14
Perma link: https://www.chemlin.org/isotope/actinium-213
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