Arsenic-74

Properties and data of the isotope ⁷⁴As.

Contents

General data

Name of the isotope:Arsenic-74; As-74Symbol:⁷⁴As or 7433AsMass number A:74 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:41Isotopic mass:73.9239286(18) u (atomic weight of Arsenic-74)Nuclide mass:73.9058261 u (calculated nuclear mass without electrons)Mass excess:-70.86005 MeVMass defect:0.689559012 u (per nucleus)Nuclear binding energy:642.32008232 MeV (per nucleus)
8.68000111 MeV (average binding energy per nucleon)Separation energy:S_N = 7.979(4) MeV (first neutron)
S_P = 6.8515(17) MeV (first proton)Half-life:17.77(2) dDecay constant λ:4.514652117071 × 10^-7 s^-1Specific activity α:3.724365888029 × 10⁺¹⁵ Bq g^-1
100658.53751432 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = - 1.596(3)Nuclear g-factor:g_l = -0.798Year of discovery:1938

Radioactive Decay

Half-life T_½ = 17.77(2) d respectively 1.535328 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁴Ge	66(2) %	2.5624(17) MeV
β^-	⁷⁴Se	34(2) %	1.3531(17) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 41) and isobaric (same nucleon number A = 74) with Arsenic-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 41	Isobar A = 74
22	⁶³Ti
23	⁶⁴V
24	⁶⁵Cr
25	⁶⁶Mn
26	⁶⁷Fe	⁷⁴Fe
27	⁶⁸Co	⁷⁴Co
28	⁶⁹Ni	⁷⁴Ni
29	⁷⁰Cu	⁷⁴Cu
30	⁷¹Zn	⁷⁴Zn
31	⁷²Ga	⁷⁴Ga
32	⁷³Ge	⁷⁴Ge
33	⁷⁴As	⁷⁴As
34	⁷⁵Se	⁷⁴Se
35	⁷⁶Br	⁷⁴Br
36	⁷⁷Kr	⁷⁴Kr
37	⁷⁸Rb	⁷⁴Rb
38	⁷⁹Sr	⁷⁴Sr
39	⁸⁰Y
40	⁸¹Zr
41	⁸²Nb
42	⁸³Mo
44	⁸⁵Ru