Arsenic-76

Properties and data of the isotope ⁷⁶As.

Contents

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

General data

Name of the isotope:Arsenic-76; As-76Symbol:⁷⁶As or 7633AsMass number A:76 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:43Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3030303030303 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:75.922392(1) u (atomic weight of Arsenic-76)Nuclide mass:75.9042895 u (calculated nuclear mass without electrons)Mass excess:-72.29139 MeVMass defect:0.708425444 u (per nucleus)Nuclear binding energy:659.89405053 MeV (per nucleus)
8.68281645 MeV (average binding energy per nucleon)Separation energy:S_N = 7.32850(7) MeV (first neutron)
S_P = 7.7234(9) MeV (first proton)Half-life:26.24(9) hDecay constant λ:7.337686108569 × 10^-6 s^-1Specific activity α:5.891810577574 × 10⁺¹⁶ Bq g^-1
1592381.2371823 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = (-)0.9023(10)Quadrupole moment Q:7.09(800) barn (100 fm²)Year of discovery:1934

Radioactive Decay

Half-life T_½ = 26.24(9) h (hours) respectively 9.4464 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁶Se	100 %	2.9606(9) MeV

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
^76mAs	44.425(1) keV	1.84(6) μs	(1)+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 76) with Arsenic-76. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 76
22	⁶⁵Ti
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn
26	⁶⁹Fe
27	⁷⁰Co	⁷⁶Co
28	⁷¹Ni	⁷⁶Ni
29	⁷²Cu	⁷⁶Cu
30	⁷³Zn	⁷⁶Zn
31	⁷⁴Ga	⁷⁶Ga
32	⁷⁵Ge	⁷⁶Ge
33	⁷⁶As	⁷⁶As
34	⁷⁷Se	⁷⁶Se
35	⁷⁸Br	⁷⁶Br
36	⁷⁹Kr	⁷⁶Kr
37	⁸⁰Rb	⁷⁶Rb
38	⁸¹Sr	⁷⁶Sr
39	⁸²Y	⁷⁶Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru