See also: List of individual Zinc isotopes (and general data sources).
General data
Name of the isotope:Zinc-66; Zn-66Symbol:66Zn or 6630ZnMass number A:66 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:36Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2 (= neutron-proton ratio)Neutron excess (N-Z):6Isotopic mass:65.926034(6) u (atomic weight of Zinc-66)Nuclide mass:65.9095771 u (calculated nuclear mass without electrons)Mass excess:-68.89889 MeVMass defect:0.62065393600001 u (per nucleus)Nuclear binding energy:578.13541746 MeV (per nucleus) 8.75962754 MeV (average binding energy per nucleon)Separation energy:SN = 11.0585(9) MeV (first neutron) SP = 8.9245(9) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)0+Charge radius:3.9491(14) femtometer fmYear of discovery:1922
Comparison of the natural Zinc isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Zinc Isotopic mixture
65.38 u
100 %
Isotope 64Zn
63.929142(5) u
49.17(75) %
stable
0+
Isotope 66Zn
65.926034(6) u
27.73(98) %
stable
0+
Isotope 67Zn
66.9271274(8) u
4.04(16) %
stable
5/2-
Isotope 68Zn
67.924845(6) u
18.45(63) %
stable
0+
Isotope 70Zn
69.92532(2) u
0.61(10) %
3.8 × 1018 years
0+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 36) and isobaric (same nucleon number A = 66) with Zinc-66. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
