Cerium-122
Properties and data of the isotope 122Ce.
See also: list of Cerium isotopes.
General data
Name of the isotope:Cerium-122; Ce-122Symbol:122Ce or 12258CeMass number A:122 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:64Isotopic mass:121.93787(43) u (atomic weight of Cerium-122)Nuclide mass:121.9060546 u (calculated nuclear mass without electrons)Mass excess:-57.87372 MeVMass defect:1.07053648 u (per nucleus)Nuclear binding energy:997.1983079 MeV (per nucleus)
8.17375662 MeV (average binding energy per nucleon)Separation energy:SN = 13.25(57) MeV (first neutron)
SP = 2.97(50) MeV (first proton)Half-life:2 sDecay constant λ:0.34657359027997 s-1Specific activity α:1.724888412396 × 10+21 Bq g-1
46618605740.451 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2005
Radioactive Decay
Half-life T½ = 2 s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC, p | 121Ba | ? | 6.67(50) MeV | |
EC, β+ | 122La | ? | | |
Parent Nuclides
Direct parent isotope is: 122Pr.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 122) with Cerium-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 64 | Isobar A = 122 |
36 | 100Kr | |
37 | 101Rb | |
38 | 102Sr | |
39 | 103Y | |
40 | 104Zr | |
41 | 105Nb | |
42 | 106Mo | |
43 | 107Tc | |
44 | 108Ru | 122Ru |
45 | 109Rh | 122Rh |
46 | 110Pd | 122Pd |
47 | 111Ag | 122Ag |
48 | 112Cd | 122Cd |
49 | 113In | 122In |
50 | 114Sn | 122Sn |
51 | 115Sb | 122Sb |
52 | 116Te | 122Te |
53 | 117I | 122I |
54 | 118Xe | 122Xe |
55 | 119Cs | 122Cs |
56 | 120Ba | 122Ba |
57 | 121La | 122La |
58 | 122Ce | 122Ce |
59 | 123Pr | 122Pr |
60 | 124Nd | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/cerium-122
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