Arsenic-86

Properties and data of the isotope ⁸⁶As.

Content

General data

Name of the isotope:Arsenic-86; As-86Symbol:⁸⁶As or 8633AsMass number A:86 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:53Isotopic mass:85.936702(4) u (atomic weight of Arsenic-86)Nuclide mass:85.9185995 u (calculated nuclear mass without electrons)Mass excess:-58.96171 MeVMass defect:0.78076460400001 u (per nucleus)Nuclear binding energy:727.27754404 MeV (per nucleus)
8.45671563 MeV (average binding energy per nucleon)Separation energy:S_N = 3.844(5) MeV (first neutron)
S_P = 12.128(5) MeV (first proton)Half-life:945(8) msDecay constant λ:0.73348907995761 s^-1Specific activity α:5.196675951447 × 10⁺²¹ Bq g^-1
140450701390.46 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1973

Radioactive Decay

Half-life T_½ = 945(8) ms respectively 9.45 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁸⁶Se		11.541(4) MeV
β^-, n	⁸⁵Se	35.5(6) %	5.380(4) MeV
β^-, 2n	⁸⁴Se	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 53) and isobaric (same nucleon number A = 86) with Arsenic-86. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 53	Isobar A = 86
29	⁸²Cu
30	⁸³Zn
31	⁸⁴Ga	⁸⁶Ga
32	⁸⁵Ge	⁸⁶Ge
33	⁸⁶As	⁸⁶As
34	⁸⁷Se	⁸⁶Se
35	⁸⁸Br	⁸⁶Br
36	⁸⁹Kr	⁸⁶Kr
37	⁹⁰Rb	⁸⁶Rb
38	⁹¹Sr	⁸⁶Sr
39	⁹²Y	⁸⁶Y
40	⁹³Zr	⁸⁶Zr
41	⁹⁴Nb	⁸⁶Nb
42	⁹⁵Mo	⁸⁶Mo
43	⁹⁶Tc	⁸⁶Tc
44	⁹⁷Ru	⁸⁶Ru
45	⁹⁸Rh
46	⁹⁹Pd
47	¹⁰⁰Ag
48	¹⁰¹Cd
49	¹⁰²In
50	¹⁰³Sn
51	¹⁰⁴Sb
52	¹⁰⁵Te