Zinc-85

Properties and data of the isotope ⁸⁵Zn.

Contents

General data

Name of the isotope:Zinc-85; Zn-85Symbol:⁸⁵Zn or 8530ZnMass number A:85 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:55Isotopic mass:84.97291(54) u (atomic weight of Zinc-85)Nuclide mass:84.9564531 u (calculated nuclear mass without electrons)Mass excess:-25.23417 MeVMass defect:0.73841134000001 u (per nucleus)Nuclear binding energy:687.82573274 MeV (per nucleus)
8.09206744 MeV (average binding energy per nucleon)Separation energy:S_N = 1.37(64) MeV (first neutron)Half-life:637 nsDecay constant λ:1088143.1405965 s^-1Specific activity α:7.801132462435 × 10⁺²⁷ Bq g^-1
2.108414179036 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2010

Radioactive Decay

Half-life T_½ = 637 ns respectively 6.37 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁸⁵Ga	?	14.62(58) MeV
β^-, n	⁸⁴Ga	?	10.79(54) MeV
β^-, 2n	⁸³Ga	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 85) with Zinc-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 55	Isobar A = 85
30	⁸⁵Zn	⁸⁵Zn
31	⁸⁶Ga	⁸⁵Ga
32	⁸⁷Ge	⁸⁵Ge
33	⁸⁸As	⁸⁵As
34	⁸⁹Se	⁸⁵Se
35	⁹⁰Br	⁸⁵Br
36	⁹¹Kr	⁸⁵Kr
37	⁹²Rb	⁸⁵Rb
38	⁹³Sr	⁸⁵Sr
39	⁹⁴Y	⁸⁵Y
40	⁹⁵Zr	⁸⁵Zr
41	⁹⁶Nb	⁸⁵Nb
42	⁹⁷Mo	⁸⁵Mo
43	⁹⁸Tc	⁸⁵Tc
44	⁹⁹Ru	⁸⁵Ru
45	¹⁰⁰Rh
46	¹⁰¹Pd
47	¹⁰²Ag
48	¹⁰³Cd
49	¹⁰⁴In
50	¹⁰⁵Sn
51	¹⁰⁶Sb
52	¹⁰⁷Te
53	¹⁰⁸I
54	¹⁰⁹Xe