Arsenic-73
Properties and data of the isotope 73As.
See also: list of Arsenic isotopes.
General data
Name of the isotope:Arsenic-73; As-73Symbol:73As or 7333AsMass number A:73 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:40Isotopic mass:72.923829(4) u (atomic weight of Arsenic-73)Nuclide mass:72.9057265 u (calculated nuclear mass without electrons)Mass excess:-70.95283 MeVMass defect:0.680993696 u (per nucleus)Nuclear binding energy:634.34154186 MeV (per nucleus)
8.68961016 MeV (average binding energy per nucleon)Separation energy:SN = 10.794(6) MeV (first neutron)
SP = 5.656(4) MeV (first proton)Half-life:80.30(6) dDecay constant λ:9.990705868040 × 10-8 s-1Specific activity α:8.356310837157 × 10+14 Bq g-1
22584.62388421 Ci g-1Spin and parity:
(nuclear angular momentum)3/2-Year of discovery:1948
Radioactive Decay
Half-life T½ = 80.30(6) d respectively 6.937920 × 106 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EE | 73Ge | 100 % | 0.345(4) MeV | |
Parent Nuclides
Direct parent isotope is: 73Se.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
73mAs | 427.902(21) keV | 5.7(2) μs | 9/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 73) with Arsenic-73. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 40 | Isobar A = 73 |
21 | 61Sc | |
22 | 62Ti | |
23 | 63V | |
24 | 64Cr | |
25 | 65Mn | |
26 | 66Fe | 73Fe |
27 | 67Co | 73Co |
28 | 68Ni | 73Ni |
29 | 69Cu | 73Cu |
30 | 70Zn | 73Zn |
31 | 71Ga | 73Ga |
32 | 72Ge | 73Ge |
33 | 73As | 73As |
34 | 74Se | 73Se |
35 | 75Br | 73Br |
36 | 76Kr | 73Kr |
37 | 77Rb | 73Rb |
38 | 78Sr | 73Sr |
39 | 79Y | |
40 | 80Zr | |
41 | 81Nb | |
42 | 82Mo | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/arsenic-73
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