Arsenic-82m

Properties and data of the isotope ⁸²As.

Content

General data

Name of the isotope:Arsenic-82m; As-82mSymbol:⁸²As or 8233AsMass number A:82 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:49Isotopic mass:81.924739(4) u (atomic weight of Arsenic-82m)
Excitation energy: 131.6(5) keVNuclide mass:81.9066365 u (calculated nuclear mass without electrons)Mass excess:-70.10517 MeVMass defect:0.75806794 u (per nucleus)Nuclear binding energy:706.1357377 MeV (per nucleus)
8.61141144 MeV (average binding energy per nucleon)Half-life:13.6(4) sDecay constant λ:0.050966704452937 s^-1Specific activity α:3.789242881263 × 10⁺²⁰ Bq g^-1
10241196976.388 Ci g^-1Spin and parity:
(nuclear angular momentum)(5-)

Radioactive Decay

Half-life T_½ = 13.6(4) s respectively 1.36 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁸²Se	100 %

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
⁸²As		19.1(5) s	(2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 82) with Arsenic-82m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 49	Isobar A = 82
27	⁷⁶Co
28	⁷⁷Ni
29	⁷⁸Cu	⁸²Cu
30	⁷⁹Zn	⁸²Zn
31	⁸⁰Ga	⁸²Ga
32	⁸¹Ge	⁸²Ge
33	⁸²As	⁸²As
34	⁸³Se	⁸²Se
35	⁸⁴Br	⁸²Br
36	⁸⁵Kr	⁸²Kr
37	⁸⁶Rb	⁸²Rb
38	⁸⁷Sr	⁸²Sr
39	⁸⁸Y	⁸²Y
40	⁸⁹Zr	⁸²Zr
41	⁹⁰Nb	⁸²Nb
42	⁹¹Mo	⁸²Mo
43	⁹²Tc
44	⁹³Ru
45	⁹⁴Rh
46	⁹⁵Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn