Technetium-117
Properties and data of the isotope 117Tc.
See also: List of individual Technetium isotopes (and general data sources).
General data
Name of the isotope:Technetium-117; Tc-117Symbol:117Tc or 11743TcMass number A:117 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:74Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.7209302325581 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:116.94806(43) u (atomic weight of Technetium-117)Nuclide mass:116.9244722 u (calculated nuclear mass without electrons)Mass excess:-48.3818 MeVMass defect:1.02962016 u (per nucleus)Nuclear binding energy:959.08500132 MeV (per nucleus)
8.1973077 MeV (average binding energy per nucleon)Separation energy:SN = 5.0(5) MeV (first neutron)
SP = 14.17(64) MeV (first proton)Half-life:44.5(20) msDecay constant λ:15.576341136179 s-1Specific activity α:8.086458655559 × 10+22 Bq g-1
2185529366367.5 Ci g-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1997
Radioactive Decay
Half-life T½ = 44.5(20) ms respectively 4.45 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 117Ru | | 11.11(59) MeV | |
| β-, n | 116Ru | | 7.62(40) MeV | |
| β-, 2n | 117Ru | | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 117) with Technetium-117. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 74 | Isobar A = 117 |
|---|
| 41 | 115Nb | |
| 42 | 116Mo | 117Mo |
| 43 | 117Tc | 117Tc |
| 44 | 118Ru | 117Ru |
| 45 | 119Rh | 117Rh |
| 46 | 120Pd | 117Pd |
| 47 | 121Ag | 117Ag |
| 48 | 122Cd | 117Cd |
| 49 | 123In | 117In |
| 50 | 124Sn | 117Sn |
| 51 | 125Sb | 117Sb |
| 52 | 126Te | 117Te |
| 53 | 127I | 117I |
| 54 | 128Xe | 117Xe |
| 55 | 129Cs | 117Cs |
| 56 | 130Ba | 117Ba |
| 57 | 131La | 117La |
| 58 | 132Ce | |
| 59 | 133Pr | |
| 60 | 134Nd | |
| 61 | 135Pm | |
| 62 | 136Sm | |
| 63 | 137Eu | |
| 64 | 138Gd | |
| 65 | 139Tb | |
| 66 | 140Dy | |
| 67 | 141Ho | |
External data and identifiers
Last update: 2020-10-15
Perma link: https://www.chemlin.org/isotope/technetium-117
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