Indium-118
Properties and data of the isotope 118In.
See also: List of individual Indium isotopes (and general data sources).
General data
Name of the isotope:Indium-118; In-118Symbol:118In or 11849InMass number A:118 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:69Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4081632653061 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:117.906357(8) u (atomic weight of Indium-118)Nuclide mass:117.8794781 u (calculated nuclear mass without electrons)Mass excess:-87.22789 MeVMass defect:1.074948772 u (per nucleus)Nuclear binding energy:1001.30833143 MeV (per nucleus)
8.48566383 MeV (average binding energy per nucleon)Separation energy:SN = 6.356(6) MeV (first neutron)
SP = 8.099(8) MeV (first proton)Half-life:5.0(5) sDecay constant λ:0.13862943611199 s-1Specific activity α:7.13543582564 × 10+20 Bq g-1
19284961690.922 Ci g-1Spin and parity:
(nuclear angular momentum)1+Charge radius:4.6335(33) femtometer fmYear of discovery:1949
Radioactive Decay
Half-life T½ = 5.0(5) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 118Sn | 100 % | 4.425(8) MeV | |
Parent Nuclides
Direct parent isotope is: 118Cd.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 118m1In | 60 keV | 4.45(5) min | 5+ |
| 118m2In | 200 keV | 8.5(3) s | 8- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 118) with Indium-118. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 69 | Isobar A = 118 |
|---|
| 38 | 107Sr | |
| 39 | 108Y | |
| 40 | 109Zr | |
| 41 | 110Nb | |
| 42 | 111Mo | 118Mo |
| 43 | 112Tc | 118Tc |
| 44 | 113Ru | 118Ru |
| 45 | 114Rh | 118Rh |
| 46 | 115Pd | 118Pd |
| 47 | 116Ag | 118Ag |
| 48 | 117Cd | 118Cd |
| 49 | 118In | 118In |
| 50 | 119Sn | 118Sn |
| 51 | 120Sb | 118Sb |
| 52 | 121Te | 118Te |
| 53 | 122I | 118I |
| 54 | 123Xe | 118Xe |
| 55 | 124Cs | 118Cs |
| 56 | 125Ba | 118Ba |
| 57 | 126La | 118La |
| 58 | 127Ce | |
| 59 | 128Pr | |
| 60 | 129Nd | |
| 61 | 130Pm | |
| 62 | 131Sm | |
| 63 | 132Eu | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/indium-118
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