See also: List of individual Zirconium isotopes (and general data sources).
General data
Name of the isotope:Zirconium-96; Zr-96Symbol:96Zr or 9640ZrMass number A:96 (= number of nucleons)Atomic number Z:40 (= number of protons)Neutrons N:56Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4 (= neutron-proton ratio)Neutron excess (N-Z):16Isotopic mass:95.90827(2) u (atomic weight of Zirconium-96)Nuclide mass:95.8863278 u (calculated nuclear mass without electrons)Mass excess:-85.44594 MeVMass defect:0.88996657599999 u (per nucleus)Nuclear binding energy:828.99852574 MeV (per nucleus) 8.63540131 MeV (average binding energy per nucleon)Separation energy:SN = 7.8502(9) MeV (first neutron) SP = 11.519(7) MeV (first proton)Half-life:2.0(4) × 1019 yearsDecay constant λ:1.098977645484 × 10-27 s-1Specific activity α:6.900549945485 × 10-6 Bq g-1 1.865013498779 × 10-16 Ci g-1Spin and parity: (nuclear angular momentum)0+Charge radius:4.3512(15) femtometer fmYear of discovery:1934
Radioactive Decay
Half-life T½ = 2.0(4) × 1019 years respectively 6.3072 × 1026 seconds s.
Comparison of the natural Zirconium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Zirconium Isotopic mixture
91.222 u
100 %
Isotope 90Zr
89.90470(2) u
51.45(4) %
stable
0+
Isotope 91Zr
90.90564021(10) u
11.22(5) %
stable
5/2+
Isotope 92Zr
91.90503(2) u
17.15(3) %
stable
0+
Isotope 94Zr
93.90631(2) u
17.38(4) %
stable
0+
Isotope 96Zr
95.90827(2) u
2.80(2) %
2.0(4) × 1019 years
0+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 56) and isobaric (same nucleon number A = 96) with Zirconium-96. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
