Tantalum-181
Properties and data of the isotope 181Ta.
See also: list of Tantalum isotopes.
General data
Name of the isotope:Tantalum-181; Ta-181Symbol:181Ta or 18173TaMass number A:181 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:108Isotopic mass:180.94800(2) u (atomic weight of Tantalum-181)Nuclide mass:180.9079576 u (calculated nuclear mass without electrons)Mass excess:-48.43769 MeVMass defect:1.559038264 u (per nucleus)Nuclear binding energy:1452.23478869 MeV (per nucleus)
8.02339662 MeV (average binding energy per nucleon)Separation energy:SN = 7.5767(13) MeV (first neutron)
SP = 5.9479(18) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = + 2.3705(7)Charge radius:5.3507(34) femtometer fmYear of discovery:1932
Parent Nuclides
Direct parent isotopes are: 181Hf, 181W.
Occurrence
Comparison of the natural Tantalum isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Tantalum
Isotopic mixture | 180.94788 u | 100 % | | |
| Isotope 180Ta | 179.9474684(21) u | 0.01201(32) % | 7.1 × 1015 a | 9- |
| Isotope 181Ta | 180.94800(2) u | 99.98799(32) % | stable | 7/2+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 181Ta
Isotope:181Ta-NMRQuantity:99.98799(32) %Spin:7/2+Nuclearmagnetic moment
μ/μN:+ 2.3705(7)Gyromagnetic ratio γ:3.2445 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.67728571428571Quadrupole moment Q:+ 3.17(2) barn (100 fm2)Resonance frequency:v0 = 5.1627 at 1 TRelative Sensitivity:0.03744 (H0 = const.)
2.5464 (v0 = const.)
[related to 1H = 1.000]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 181) with Tantalum-181. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 108 | Isobar A = 181 |
|---|
| 66 | 174Dy | |
| 67 | 175Ho | |
| 68 | 176Er | |
| 69 | 177Tm | |
| 70 | 178Yb | 181Yb |
| 71 | 179Lu | 181Lu |
| 72 | 180Hf | 181Hf |
| 73 | 181Ta | 181Ta |
| 74 | 182W | 181W |
| 75 | 183Re | 181Re |
| 76 | 184Os | 181Os |
| 77 | 185Ir | 181Ir |
| 78 | 186Pt | 181Pt |
| 79 | 187Au | 181Au |
| 80 | 188Hg | 181Hg |
| 81 | 189Tl | 181Tl |
| 82 | 190Pb | 181Pb |
| 83 | 191Bi | |
| 84 | 192Po | |
| 85 | 193At | |
| 86 | 194Rn | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/tantalum-181
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