Samarium-152
Properties and data of the isotope 152Sm.
See also: List of individual Samarium isotopes (and general data sources).
General data
Name of the isotope:Samarium-152; Sm-152Symbol:152Sm or 15262SmMass number A:152 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:90Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4516129032258 (= neutron-proton ratio)Neutron excess (N-Z):28Isotopic mass:151.91974(2) u (atomic weight of Samarium-152)Nuclide mass:151.8857307 u (calculated nuclear mass without electrons)Mass excess:-74.76171 MeVMass defect:1.345254424 u (per nucleus)Nuclear binding energy:1253.09642443 MeV (per nucleus)
8.24405542 MeV (average binding energy per nucleon)Separation energy:SN = 8.2576(6) MeV (first neutron)
SP = 8.666(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.0819(60) femtometer fmYear of discovery:1933
Parent Nuclides
Direct parent isotopes are: 152Pm, 152Eu.
Occurrence
Comparison of the natural Samarium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Samarium
Isotopic mixture | 150.36 u | 100 % | | |
| Isotope 144Sm | 143.91201(2) u | 3.08(4) % | stable | 0+ |
| Isotope 148Sm | 147.91483(2) u | 11.25(9) % | 7(3)×1015 a | 0+ |
| Isotope 149Sm | 148.91719(2) u | 13.82(10) % | stable | 7/2- |
| Isotope 150Sm | 149.91728(2) u | 7.37(9) % | stable | 0+ |
| Isotope 152Sm | 151.91974(2) u | 26.74(9) % | stable | 0+ |
| Isotope 154Sm | 153.92222(2) u | 22.74(14) % | stable | 0+ |
| Isotope 147Sm | 146.91490(2) u | 15.00(14) % | 1.0625(38) × 1011 a | 7/2- |
| Isotope 146Sm | 145.913047(3) u |
[trace] | 9.20 (26) × 107 a | 0+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 152) with Samarium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 90 | Isobar A = 152 |
|---|
| 50 | 140Sn | |
| 51 | 141Sb | |
| 52 | 142Te | |
| 53 | 143I | |
| 54 | 144Xe | |
| 55 | 145Cs | |
| 56 | 146Ba | 152Ba |
| 57 | 147La | 152La |
| 58 | 148Ce | 152Ce |
| 59 | 149Pr | 152Pr |
| 60 | 150Nd | 152Nd |
| 61 | 151Pm | 152Pm |
| 62 | 152Sm | 152Sm |
| 63 | 153Eu | 152Eu |
| 64 | 154Gd | 152Gd |
| 65 | 155Tb | 152Tb |
| 66 | 156Dy | 152Dy |
| 67 | 157Ho | 152Ho |
| 68 | 158Er | 152Er |
| 69 | 159Tm | 152Tm |
| 70 | 160Yb | 152Yb |
| 71 | 161Lu | 152Lu |
| 72 | 162Hf | |
| 73 | 163Ta | |
| 74 | 164W | |
| 75 | 165Re | |
| 76 | 166Os | |
| 77 | 167Ir | |
| 78 | 168Pt | |
| 80 | 170Hg | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/samarium-152
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