Arsenic-70
Properties and data of the isotope 70As.
See also: list of Arsenic isotopes.
General data
Name of the isotope:Arsenic-70; As-70Symbol:70As or 7033AsMass number A:70 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:37Isotopic mass:69.93093(5) u (atomic weight of Arsenic-70)Nuclide mass:69.9128275 u (calculated nuclear mass without electrons)Mass excess:-64.33829 MeVMass defect:0.64789794799999 u (per nucleus)Nuclear binding energy:603.51305117 MeV (per nucleus)
8.62161502 MeV (average binding energy per nucleon)Separation energy:SN = 9.30(60) MeV (first neutron)
SP = 4.53(50) MeV (first proton)Half-life:52.6(3) minDecay constant λ:0.00021962838420784 s-1Specific activity α:1.916859516724 × 10+18 Bq g-1
51807013.965527 Ci g-1Spin and parity:
(nuclear angular momentum)4+Magnetic dipole moment:μ(μN) = +2.1104(5)Quadrupole moment Q:0.09(2) barn (100 fm2)Nuclear g-factor:gl = 0.5276Year of discovery:1950
Radioactive Decay
Half-life T½ = 52.6(3) min (minutes) respectively 3.156 × 103 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 70Ge | 100 % | 6.22(5) MeV | |
Parent Nuclides
Direct parent isotope is: 70Se.
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 |
---|
70mAs | 32.046(23) keV | 96(3) μs | 2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 70) with Arsenic-70. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 37 | Isobar A = 70 |
19 | 56K | |
20 | 57Ca | |
21 | 58Sc | |
22 | 59Ti | |
23 | 60V | |
24 | 61Cr | |
25 | 62Mn | 70Mn |
26 | 63Fe | 70Fe |
27 | 64Co | 70Co |
28 | 65Ni | 70Ni |
29 | 66Cu | 70Cu |
30 | 67Zn | 70Zn |
31 | 68Ga | 70Ga |
32 | 69Ge | 70Ge |
33 | 70As | 70As |
34 | 71Se | 70Se |
35 | 72Br | 70Br |
36 | 73Kr | 70Kr |
37 | 74Rb | |
38 | 75Sr | |
39 | 76Y | |
40 | 77Zr | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/arsenic-70
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