Cerium-125
Properties and data of the isotope 125Ce.
See also: list of Cerium isotopes.
General data
Name of the isotope:Cerium-125; Ce-125Symbol:125Ce or 12558CeMass number A:125 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:67Isotopic mass:124.92844(21) u (atomic weight of Cerium-125)Nuclide mass:124.8966246 u (calculated nuclear mass without electrons)Mass excess:-66.65771 MeVMass defect:1.105961228 u (per nucleus)Nuclear binding energy:1030.19624811 MeV (per nucleus)
8.24156998 MeV (average binding energy per nucleon)Separation energy:SN = 9.81(36) MeV (first neutron)
SP = 3.69(20) MeV (first proton)Half-life:9.7(3) sDecay constant λ:0.071458472222675 s-1Specific activity α:3.47042730129 × 10+20 Bq g-1
9379533246.7486 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1978
Radioactive Decay
Half-life T½ = 9.7(3) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 125La | < 100 % | 7.10(20) MeV | |
β+, p | 124Ba | ? | | |
Parent Nuclides
Direct parent isotope is: 125Pr.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 125) with Cerium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 67 | Isobar A = 125 |
38 | 105Sr | |
39 | 106Y | |
40 | 107Zr | |
41 | 108Nb | |
42 | 109Mo | |
43 | 110Tc | |
44 | 111Ru | |
45 | 112Rh | 125Rh |
46 | 113Pd | 125Pd |
47 | 114Ag | 125Ag |
48 | 115Cd | 125Cd |
49 | 116In | 125In |
50 | 117Sn | 125Sn |
51 | 118Sb | 125Sb |
52 | 119Te | 125Te |
53 | 120I | 125I |
54 | 121Xe | 125Xe |
55 | 122Cs | 125Cs |
56 | 123Ba | 125Ba |
57 | 124La | 125La |
58 | 125Ce | 125Ce |
59 | 126Pr | 125Pr |
60 | 127Nd | 125Nd |
61 | 128Pm | |
62 | 129Sm | |
63 | 130Eu | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/cerium-125
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