Hafnium-176
Properties and data of the isotope 176Hf.
See also: List of individual Hafnium isotopes (and general data sources).
General data
Name of the isotope:Hafnium-176; Hf-176Symbol:176Hf or 17672HfMass number A:176 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:104Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4444444444444 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:175.94141(2) u (atomic weight of Hafnium-176)Nuclide mass:175.901916 u (calculated nuclear mass without electrons)Mass excess:-54.57623 MeVMass defect:1.523143568 u (per nucleus)Nuclear binding energy:1418.79909473 MeV (per nucleus)
8.06135849 MeV (average binding energy per nucleon)Separation energy:SN = 8.1660(18) MeV (first neutron)
SP = 6.6997(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.3286(32) femtometer fmYear of discovery:1934
Parent Nuclides
Direct parent isotopes are: 176Ta, 176Lu.
Occurrence
Comparison of the natural Hafnium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Hafnium
Isotopic mixture | 178.486 u | 100 % | | |
| Isotope 174Hf | 173.94005(2) u | 0.16(12) % | 2.0(4) × 1015 a | 0+ |
| Isotope 176Hf | 175.94141(2) u | 5.26(70) % | stable | 0+ |
| Isotope 177Hf | 176.94323(2) u | 18.60(16) % | stable | 7/2- |
| Isotope 178Hf | 177.94371(2) u | 27.28(28) % | stable | 0+ |
| Isotope 179Hf | 178.94582(2) u | 13.62(11) % | stable | 9/2+ |
| Isotope 180Hf | 179.94656(2) u | 35.08(33) % | stable | 0+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 176) with Hafnium-176. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 104 | Isobar A = 176 |
|---|
| 62 | 166Sm | |
| 63 | 167Eu | |
| 64 | 168Gd | |
| 65 | 169Tb | |
| 66 | 170Dy | |
| 67 | 171Ho | |
| 68 | 172Er | 176Er |
| 69 | 173Tm | 176Tm |
| 70 | 174Yb | 176Yb |
| 71 | 175Lu | 176Lu |
| 72 | 176Hf | 176Hf |
| 73 | 177Ta | 176Ta |
| 74 | 178W | 176W |
| 75 | 179Re | 176Re |
| 76 | 180Os | 176Os |
| 77 | 181Ir | 176Ir |
| 78 | 182Pt | 176Pt |
| 79 | 183Au | 176Au |
| 80 | 184Hg | 176Hg |
| 81 | 185Tl | 176Tl |
| 82 | 186Pb | |
| 83 | 187Bi | |
| 84 | 188Po | |
| 85 | 189At | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/hafnium-176
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