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:42Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.75 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic 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:2.636306256541 × 10+23 Bq g-1 7125152044707.8 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.
