Iodine-135
Properties and data of the isotope 135I.
See also: List of individual Iodine isotopes (and general data sources).
General data
Name of the isotope:Iodine-135; I-135Other names:Jod-135Symbol:135I or 13553IMass number A:135 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:82Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5471698113208 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:134.9100594(22) u (atomic weight of Iodine-135)Nuclide mass:134.8809865 u (calculated nuclear mass without electrons)Mass excess:-83.77913 MeVMass defect:1.215190408 u (per nucleus)Nuclear binding energy:1131.94257391 MeV (per nucleus)
8.38475981 MeV (average binding energy per nucleon)Separation energy:SN = 7.807(5) MeV (first neutron)
SP = 8.534(3) MeV (first proton)Half-life:6.58(3) hDecay constant λ:2.926153244511 × 10-5 s-1Specific activity α:1.315052762403 × 10+17 Bq g-1
3554196.6551454 Ci g-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = +2.940(2)Nuclear g-factor:gl = 0.84Year of discovery:1940
Radioactive Decay
Half-life T½ = 6.58(3) h (hours) respectively 2.3688 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 135Xe | 100 % | 2.634(4) MeV | |
Parent Nuclides
Direct parent isotopes are: 135Te, 136Te, 248Cm.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 135) with Iodine-135. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 82 | Isobar A = 135 |
|---|
| 45 | 127Rh | |
| 46 | 128Pd | |
| 47 | 129Ag | |
| 48 | 130Cd | |
| 49 | 131In | 135In |
| 50 | 132Sn | 135Sn |
| 51 | 133Sb | 135Sb |
| 52 | 134Te | 135Te |
| 53 | 135I | 135I |
| 54 | 136Xe | 135Xe |
| 55 | 137Cs | 135Cs |
| 56 | 138Ba | 135Ba |
| 57 | 139La | 135La |
| 58 | 140Ce | 135Ce |
| 59 | 141Pr | 135Pr |
| 60 | 142Nd | 135Nd |
| 61 | 143Pm | 135Pm |
| 62 | 144Sm | 135Sm |
| 63 | 145Eu | 135Eu |
| 64 | 146Gd | 135Gd |
| 65 | 147Tb | 135Tb |
| 66 | 148Dy | |
| 67 | 149Ho | |
| 68 | 150Er | |
| 69 | 151Tm | |
| 70 | 152Yb | |
| 71 | 153Lu | |
| 72 | 154Hf | |
| 73 | 155Ta | |
| 74 | 156W | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/iodine-135
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