Rutherfordium-258
Properties and data of the isotope 258Rf.
See also: list of Rutherfordium isotopes.
General data
Name of the isotope:Rutherfordium-258; Rf-258Symbol:258Rf or 258104RfMass number A:258 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:154Isotopic mass:258.10343(3) u (atomic weight of Rutherfordium-258)Nuclide mass:258.0463866 u (calculated nuclear mass without electrons)Mass excess:96.34442 MeVMass defect:2.044770392 u (per nucleus)Nuclear binding energy:1904.69135153 MeV (per nucleus)
7.38252462 MeV (average binding energy per nucleon)Separation energy:SN = 7.60(3) MeV (first neutron)
SP = 8.61(5) MeV (first proton)Half-life:12.0(12) msDecay constant λ:57.762265046662 s-1Specific activity α:1.348265490310 × 10+23 Bq g-1
3643960784621.9 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1969
Radioactive Decay
Half-life T½ = 12.0(12) ms respectively 1.20 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 254No | 4.9(16) % | 9.19(3) MeV | |
SZ | div | 95.1(16) % | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 154) and isobaric (same nucleon number A = 258) with Rutherfordium-258. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 154 | Isobar A = 258 |
95 | 249Am | |
96 | 250Cm | |
97 | 251Bk | |
98 | 252Cf | |
99 | 253Es | |
100 | 254Fm | 258Fm |
101 | 255Md | 258Md |
102 | 256No | 258No |
103 | 257Lr | 258Lr |
104 | 258Rf | 258Rf |
105 | 259Db | 258Db |
106 | 260Sg | 258Sg |
107 | 261Bh | |
External data and identifiers
Last update: 2020-11-04
Perma link: https://www.chemlin.org/isotope/rutherfordium-258
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