Chromium-66
Properties and data of the isotope 66Cr.
See also: List of individual Chromium isotopes (and general data sources).
General data
Name of the isotope:Chromium-66; Cr-66Symbol:66Cr or 6624CrMass number A:66 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:42Isotopic mass:65.97346(43) u (atomic weight of Chromium-66)Nuclide mass:65.9602944 u (calculated nuclear mass without electrons)Mass excess:-24.72185 MeVMass defect:0.57826724 u (per nucleus)Nuclear binding energy:538.65246446 MeV (per nucleus)
8.16140098 MeV (average binding energy per nucleon)Separation energy:SN = 4.57(50) MeV (first neutron)
SP = 2.023(64) MeV (first proton)Half-life:24(2) msDecay constant λ:28.881132523331 s-1Specific activity α:2.675788434615 × 10+23 Bq g-1
7231860634095.7 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1997
Radioactive Decay
Half-life T½ = 24(2) ms respectively 2.4 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 66Mn | 100 % | 12.03(40) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 66) with Chromium-66. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 42 | Isobar A = 66 |
|---|
| 21 | 63Sc | |
| 22 | 64Ti | 66Ti |
| 23 | 65V | 66V |
| 24 | 66Cr | 66Cr |
| 25 | 67Mn | 66Mn |
| 26 | 68Fe | 66Fe |
| 27 | 69Co | 66Co |
| 28 | 70Ni | 66Ni |
| 29 | 71Cu | 66Cu |
| 30 | 72Zn | 66Zn |
| 31 | 73Ga | 66Ga |
| 32 | 74Ge | 66Ge |
| 33 | 75As | 66As |
| 34 | 76Se | 66Se |
| 35 | 77Br | 66Br |
| 36 | 78Kr | |
| 37 | 79Rb | |
| 38 | 80Sr | |
| 39 | 81Y | |
| 40 | 82Zr | |
| 41 | 83Nb | |
| 42 | 84Mo | |
| 43 | 85Tc | |
| 44 | 86Ru | |
External data and identifiers
Last update: 2020-10-13
Perma link: https://www.chemlin.org/isotope/chromium-66
© 1996 - 2025 ChemLin
