Zinc-68

Properties and data of the isotope ⁶⁸Zn.

Contents

See also: List of individual Zinc isotopes (and general data sources).

General data

Name of the isotope:Zinc-68; Zn-68Symbol:⁶⁸Zn or 6830ZnMass number A:68 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:38Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2666666666667 (= neutron-proton ratio)Neutron excess (N-Z):8Isotopic mass:67.924845(6) u (atomic weight of Zinc-68)Nuclide mass:67.9083881 u (calculated nuclear mass without electrons)Mass excess:-70.00643 MeVMass defect:0.63917276799999 u (per nucleus)Nuclear binding energy:595.38559836 MeV (per nucleus)
8.75567056 MeV (average binding energy per nucleon)Separation energy:S_N = 10.19810(19) MeV (first neutron)
S_P = 9.9765(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.9658(14) femtometer fmYear of discovery:1922

Parent Nuclides

Direct parent isotopes are: ⁶⁸Ga, ⁶⁸Cu.

Occurrence

Comparison of the natural Zinc isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	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	66.927128(6) 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 a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 68) with Zinc-68. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 38	Isobar A = 68
19	⁵⁷K
20	⁵⁸Ca
21	⁵⁹Sc
22	⁶⁰Ti
23	⁶¹V	⁶⁸V
24	⁶²Cr	⁶⁸Cr
25	⁶³Mn	⁶⁸Mn
26	⁶⁴Fe	⁶⁸Fe
27	⁶⁵Co	⁶⁸Co
28	⁶⁶Ni	⁶⁸Ni
29	⁶⁷Cu	⁶⁸Cu
30	⁶⁸Zn	⁶⁸Zn
31	⁶⁹Ga	⁶⁸Ga
32	⁷⁰Ge	⁶⁸Ge
33	⁷¹As	⁶⁸As
34	⁷²Se	⁶⁸Se
35	⁷³Br	⁶⁸Br
36	⁷⁴Kr	⁶⁸Kr
37	⁷⁵Rb
38	⁷⁶Sr
39	⁷⁷Y
40	⁷⁸Zr