Xenon-142
Properties and data of the isotope 142Xe.
See also: List of individual Xenon isotopes (and general data sources).
General data
Name of the isotope:Xenon-142; Xe-142Symbol:142Xe or 14254XeMass number A:142 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:88Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6296296296296 (= neutron-proton ratio)Neutron excess (N-Z):34Isotopic mass:141.9299731(29) u (atomic weight of Xenon-142)Nuclide mass:141.9003517 u (calculated nuclear mass without electrons)Mass excess:-65.22964 MeVMass defect:1.255091236 u (per nucleus)Nuclear binding energy:1169.10995579 MeV (per nucleus)
8.2331687 MeV (average binding energy per nucleon)Separation energy:SN = 5.104(4) MeV (first neutron)
SP = 12.592(16) MeV (first proton)Half-life:1.23(2) sDecay constant λ:0.56353429313817 s-1Specific activity α:2.406867299775 × 10+21 Bq g-1
65050467561.489 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.8841(168) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 1.23(2) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 142Cs | 99.8 % | 5.285(8) MeV | |
| β-, n | 141Cs | 0.21(6) % | 1.177(10) MeV | |
Parent Nuclides
Direct parent isotope is: 248Cm.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 142) with Xenon-142. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 88 | Isobar A = 142 |
|---|
| 49 | 137In | |
| 50 | 138Sn | |
| 51 | 139Sb | |
| 52 | 140Te | 142Te |
| 53 | 141I | 142I |
| 54 | 142Xe | 142Xe |
| 55 | 143Cs | 142Cs |
| 56 | 144Ba | 142Ba |
| 57 | 145La | 142La |
| 58 | 146Ce | 142Ce |
| 59 | 147Pr | 142Pr |
| 60 | 148Nd | 142Nd |
| 61 | 149Pm | 142Pm |
| 62 | 150Sm | 142Sm |
| 63 | 151Eu | 142Eu |
| 64 | 152Gd | 142Gd |
| 65 | 153Tb | 142Tb |
| 66 | 154Dy | 142Dy |
| 67 | 155Ho | 142Ho |
| 68 | 156Er | |
| 69 | 157Tm | |
| 70 | 158Yb | |
| 71 | 159Lu | |
| 72 | 160Hf | |
| 73 | 161Ta | |
| 74 | 162W | |
| 75 | 163Re | |
| 76 | 164Os | |
| 77 | 165Ir | |
| 78 | 166Pt | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/xenon-142
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