Technetium-85

Properties and data of the isotope ⁸⁵Tc.

Contents

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

General data

Name of the isotope:Technetium-85; Tc-85Symbol:⁸⁵Tc or 8543TcMass number A:85 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:42Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):0.97674418604651 (= neutron-proton ratio)Neutron excess (N-Z):-1Isotopic mass:84.95078(43) u (atomic weight of Technetium-85)Nuclide mass:84.9271922 u (calculated nuclear mass without electrons)Mass excess:-45.84813 MeVMass defect:0.74962284800002 u (per nucleus)Nuclear binding energy:698.26918517 MeV (per nucleus)
8.21493159 MeV (average binding energy per nucleon)Separation energy:S_N = 16.22(56) MeV (first neutron)Half-life:100 nsDecay constant λ:6931471.8055995 s^-1Specific activity α:4.969321378571 × 10⁺²⁸ Bq g^-1
1.343059832046 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)Mirror nucleus:Molybdenum-85

Radioactive Decay

Half-life T_½ = 100 ns respectively 1.0 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	⁸⁴Mo	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 85) with Technetium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 85
21	⁶³Sc
22	⁶⁴Ti
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe
27	⁶⁹Co
28	⁷⁰Ni
29	⁷¹Cu
30	⁷²Zn	⁸⁵Zn
31	⁷³Ga	⁸⁵Ga
32	⁷⁴Ge	⁸⁵Ge
33	⁷⁵As	⁸⁵As
34	⁷⁶Se	⁸⁵Se
35	⁷⁷Br	⁸⁵Br
36	⁷⁸Kr	⁸⁵Kr
37	⁷⁹Rb	⁸⁵Rb
38	⁸⁰Sr	⁸⁵Sr
39	⁸¹Y	⁸⁵Y
40	⁸²Zr	⁸⁵Zr
41	⁸³Nb	⁸⁵Nb
42	⁸⁴Mo	⁸⁵Mo
43	⁸⁵Tc	⁸⁵Tc
44	⁸⁶Ru	⁸⁵Ru