Iodine-128m2
Properties and data of the isotope 128I.
See also: list of Iodine isotopes.
General data
Name of the isotope:Iodine-128m2; I-128m2Other names:Jod-128m2Symbol:128I or 12853IMass number A:128 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:75Isotopic mass:127.905809(4) u (atomic weight of Iodine-128m2)
Excitation energy: 167.368(4) keVNuclide mass:127.8767361 u (calculated nuclear mass without electrons)Mass excess:-87.73835 MeVMass defect:1.158786396 u (per nucleus)Nuclear binding energy:1079.40257516 MeV (per nucleus)
8.43283262 MeV (average binding energy per nucleon)Half-life:175(15) nsDecay constant λ:3960841.0317711 s-1Specific activity α:1.878168710011 × 10+28 Bq g-1
5.076131648678 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)(6)-
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 |
---|
128I | | 24.99(2) min | 1+ |
128m1I | 137.851(3) keV | 0.845(20) μs | 4- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 128) with Iodine-128m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 75 | Isobar A = 128 |
42 | 117Mo | |
43 | 118Tc | |
44 | 119Ru | |
45 | 120Rh | |
46 | 121Pd | 128Pd |
47 | 122Ag | 128Ag |
48 | 123Cd | 128Cd |
49 | 124In | 128In |
50 | 125Sn | 128Sn |
51 | 126Sb | 128Sb |
52 | 127Te | 128Te |
53 | 128I | 128I |
54 | 129Xe | 128Xe |
55 | 130Cs | 128Cs |
56 | 131Ba | 128Ba |
57 | 132La | 128La |
58 | 133Ce | 128Ce |
59 | 134Pr | 128Pr |
60 | 135Nd | 128Nd |
61 | 136Pm | 128Pm |
62 | 137Sm | 128Sm |
63 | 138Eu | |
64 | 139Gd | |
65 | 140Tb | |
66 | 141Dy | |
67 | 142Ho | |
68 | 143Er | |
69 | 144Tm | |
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/iodine-128m2
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