Samarium-154
Properties and data of the isotope 154Sm.
See also: List of individual Samarium isotopes (and general data sources).
General data
Name of the isotope:Samarium-154; Sm-154Symbol:154Sm or 15462SmMass number A:154 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:92Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4838709677419 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:153.92222(2) u (atomic weight of Samarium-154)Nuclide mass:153.8882107 u (calculated nuclear mass without electrons)Mass excess:-72.4516 MeVMass defect:1.360104256 u (per nucleus)Nuclear binding energy:1266.92895384 MeV (per nucleus)
8.22681139 MeV (average binding energy per nucleon)Separation energy:SN = 7.9668(8) MeV (first neutron)
SP = 9.096(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.1053(67) femtometer fmYear of discovery:1933
Parent Nuclides
Direct parent isotopes are: 154Pm, 154Eu.
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 = 92) and isobaric (same nucleon number A = 154) with Samarium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 92 | Isobar A = 154 |
|---|
| 53 | 145I | |
| 54 | 146Xe | |
| 55 | 147Cs | |
| 56 | 148Ba | |
| 57 | 149La | 154La |
| 58 | 150Ce | 154Ce |
| 59 | 151Pr | 154Pr |
| 60 | 152Nd | 154Nd |
| 61 | 153Pm | 154Pm |
| 62 | 154Sm | 154Sm |
| 63 | 155Eu | 154Eu |
| 64 | 156Gd | 154Gd |
| 65 | 157Tb | 154Tb |
| 66 | 158Dy | 154Dy |
| 67 | 159Ho | 154Ho |
| 68 | 160Er | 154Er |
| 69 | 161Tm | 154Tm |
| 70 | 162Yb | 154Yb |
| 71 | 163Lu | 154Lu |
| 72 | 164Hf | 154Hf |
| 73 | 165Ta | |
| 74 | 166W | |
| 75 | 167Re | |
| 76 | 168Os | |
| 77 | 169Ir | |
| 78 | 170Pt | |
| 79 | 171Au | |
| 80 | 172Hg | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/samarium-154
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