Tantalum-177
Properties and data of the isotope 177Ta.
See also: List of individual Tantalum isotopes (and general data sources).
General data
Name of the isotope:Tantalum-177; Ta-177Symbol:177Ta or 17773TaMass number A:177 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:104Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4246575342466 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:176.944482(4) u (atomic weight of Tantalum-177)Nuclide mass:176.9044396 u (calculated nuclear mass without electrons)Mass excess:-51.71468 MeVMass defect:1.5278966 u (per nucleus)Nuclear binding energy:1423.22651552 MeV (per nucleus)
8.04082777 MeV (average binding energy per nucleon)Separation energy:SN = 8.42(3) MeV (first neutron)
SP = 4.427(3) MeV (first proton)Half-life:56.36(13) hDecay constant λ:3.41626833727 × 10-6 s-1Specific activity α:1.168934610364 × 10+16 Bq g-1
315928.27307151 Ci g-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = 2.25(5)Nuclear g-factor:gl = 0.64285714285714Year of discovery:1948
Radioactive Decay
Half-life T½ = 56.36(13) h (hours) respectively 2.02896 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 177Hf | 100 % | 1.166(4) MeV | |
Parent Nuclides
Direct parent isotope is: 177W.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 177) with Tantalum-177. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 104 | Isobar A = 177 |
|---|
| 62 | 166Sm | |
| 63 | 167Eu | |
| 64 | 168Gd | |
| 65 | 169Tb | |
| 66 | 170Dy | |
| 67 | 171Ho | |
| 68 | 172Er | 177Er |
| 69 | 173Tm | 177Tm |
| 70 | 174Yb | 177Yb |
| 71 | 175Lu | 177Lu |
| 72 | 176Hf | 177Hf |
| 73 | 177Ta | 177Ta |
| 74 | 178W | 177W |
| 75 | 179Re | 177Re |
| 76 | 180Os | 177Os |
| 77 | 181Ir | 177Ir |
| 78 | 182Pt | 177Pt |
| 79 | 183Au | 177Au |
| 80 | 184Hg | 177Hg |
| 81 | 185Tl | 177Tl |
| 82 | 186Pb | |
| 83 | 187Bi | |
| 84 | 188Po | |
| 85 | 189At | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/tantalum-177
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