Actinium-214
Properties and data of the isotope 214Ac.
Actinium-214 is a radioisotope of the chemical element actinium, which, in addition to element-specific 89 protons, has 125 neutrons in the atomic nucleus, resulting in the mass number 214. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with 214Ac is for academic purposes only.
See also: list of Actinium isotopes.
General data
Name of the isotope:Actinium-214; Ac-214Symbol:214Ac or 21489AcMass number A:214 (= number of nucleons)Atomic number Z:89 (= number of protons)Neutrons N:125Isotopic mass:214.006918(16) u (atomic weight of Actinium-214)Nuclide mass:213.9581006 u (calculated nuclear mass without electrons)Mass excess:6.44408 MeVMass defect:1.772624348 u (per nucleus)Nuclear binding energy:1651.18894442 MeV (per nucleus)
7.71583619 MeV (average binding energy per nucleon)Separation energy:SN = 7.782(22) MeV (first neutron)
SP = 1.191(18) MeV (first proton)Half-life:8.2(2) sDecay constant λ:0.084530143970725 s-1Specific activity α:2.378749691132 × 10+20 Bq g-1
6429053219.2781 Ci g-1Spin and parity:
(nuclear angular momentum)(5+)Magnetic dipole moment:μ(μN) = +4.83(20)Nuclear g-factor:gl = 0.966Year of discovery:1968
Radioactive Decay
Half-life T½ = 8.2(2) s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 210Fr | > 89(3) % | 7.3521(25) MeV | |
| EE | 214Ra | < 11(3) % | 6.351(16) MeV | |
Parent Nuclides
Direct parent isotope is: 218Pa.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 125) and isobaric (same nucleon number A = 214) with Actinium-214. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 125 | Isobar A = 214 |
|---|
| 76 | 201Os | |
| 77 | 202Ir | |
| 78 | 203Pt | |
| 79 | 204Au | |
| 80 | 205Hg | 214Hg |
| 81 | 206Tl | 214Tl |
| 82 | 207Pb | 214Pb |
| 83 | 208Bi | 214Bi |
| 84 | 209Po | 214Po |
| 85 | 210At | 214At |
| 86 | 211Rn | 214Rn |
| 87 | 212Fr | 214Fr |
| 88 | 213Ra | 214Ra |
| 89 | 214Ac | 214Ac |
| 90 | 215Th | 214Th |
| 91 | 216Pa | 214Pa |
| 92 | 217U | 214U |
External data and identifiers
Last update: 2022-12-14
Perma link: https://www.chemlin.org/isotope/actinium-214
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