Strontium-89
Properties and data of the isotope 89Sr.
See also: List of individual Strontium isotopes (and general data sources).
General data
Name of the isotope:Strontium-89; Sr-89Symbol:89Sr or 8938SrMass number A:89 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:51Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3421052631579 (= neutron-proton ratio)Neutron excess (N-Z):13Isotopic mass:88.90745081(10) u (atomic weight of Strontium-89)Nuclide mass:88.8866056 u (calculated nuclear mass without electrons)Mass excess:-86.20902 MeVMass defect:0.831811122 u (per nucleus)Nuclear binding energy:774.82706928 MeV (per nucleus)
8.70592213 MeV (average binding energy per nucleon)Separation energy:SN = 6.35872(9) MeV (first neutron)
SP = 10.88899(18) MeV (first proton)Half-life:50.563(25) dDecay constant λ:1.586641776009 × 10-7 s-1Specific activity α:1.085793212430 × 10+15 Bq g-1
29345.762498124 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = -1.1481(8)Quadrupole moment Q:0.271(9) barn (100 fm2)Nuclear g-factor:gl = -0.45924Charge radius:4.2407(23) femtometer fmYear of discovery:1937
Radioactive Decay
Half-life T½ = 50.563(25) d respectively 4.3686432 × 106 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 89Y | 100% | 1.5022(4) MeV | |
Parent Nuclides
Direct parent isotope is: 89Rb.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 51) and isobaric (same nucleon number A = 89) with Strontium-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 51 | Isobar A = 89 |
|---|
| 28 | 79Ni | |
| 29 | 80Cu | |
| 30 | 81Zn | |
| 31 | 82Ga | |
| 32 | 83Ge | 89Ge |
| 33 | 84As | 89As |
| 34 | 85Se | 89Se |
| 35 | 86Br | 89Br |
| 36 | 87Kr | 89Kr |
| 37 | 88Rb | 89Rb |
| 38 | 89Sr | 89Sr |
| 39 | 90Y | 89Y |
| 40 | 91Zr | 89Zr |
| 41 | 92Nb | 89Nb |
| 42 | 93Mo | 89Mo |
| 43 | 94Tc | 89Tc |
| 44 | 95Ru | 89Ru |
| 45 | 96Rh | 89Rh |
| 46 | 97Pd | |
| 47 | 98Ag | |
| 48 | 99Cd | |
| 49 | 100In | |
| 50 | 101Sn | |
External data and identifiers
Last update: 2023-05-25
Perma link: https://www.chemlin.org/isotope/strontium-89
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