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Isotopes of arsenic

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Isotopes of arsenic (33As)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
As synth 80.3 d ε Ge
γ –
As synth 17.8 d ε Ge
β Ge
γ –
β Se
As 100% stable
Standard atomic weight Ar°(As)
  • 74.921595±0.000006
  • 74.922±0.001 (abridged)

Arsenic (33As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is As with a half-life of 80 days.

List of isotopes


Nuclide
 Z N Isotopic mass (Da)
 Half-life
 Decay
mode
 Daughter
isotope
 Spin and
parity
 Isotopic
abundance
Excitation energy
As 33 31 63.95756(22)# 69.0(14) ms β Ge 0+#
β, p? Ga
As 33 32 64.949611(91) 130.3(6) ms β Ge 3/2−#
β, p? Ga
As 33 33 65.9441488(61) 95.77(23) ms β Ge 0+
As 1356.63(17) keV 1.14(4) μs IT As 5+
As 3023.(3) keV 7.98(26) μs IT As 9+
As 33 34 66.93925111(48) 42.5(12) s β Ge (5/2−)
As 33 35 67.9367741(20) 151.6(8) s β Ge 3+
As 425.1(2) keV 111(20) ns IT As 1+
As 33 36 68.932246(34) 15.2(2) min β Ge 5/2−
As 33 37 69.9309346(15) 52.6(3) min β Ge 4+
As 32.046(23) keV 96(3) μs IT As 2+
As 33 38 70.9271136(45) 65.30(7) h β Ge 5/2−
As 33 39 71.9267523(44) 26.0(1) h β Ge 2−
As 33 40 72.9238291(41) 80.30(6) d EC Ge 3/2−
As 427.902(21) keV 5.7(2) μs IT As 9/2+
As 33 41 73.9239286(18) 17.77(2) d β (66%) Ge 2−
β (34%) Se
As 33 42 74.92159456(95) Stable 3/2− 1.0000
As 303.9243(8) keV 17.62(23) ms IT As 9/2+
As 33 43 75.92239201(95) 1.0933(38) d β Se 2−
As 44.425(1) keV 1.84(6) μs IT As (1)+
As 33 44 76.9206476(18) 38.79(5) h β Se 3/2−
As 475.48(4) keV 114.0(25) μs IT As 9/2+
As 33 45 77.921828(10) 90.7(2) min β Se 2−
As 33 46 78.9209484(57) 9.01(15) min β Se 3/2−
As 772.81(6) keV 1.21(1) μs IT As (9/2)+
As 33 47 79.9224744(36) 15.2(2) s β Se 1+
As 33 48 80.9221323(28) 33.3(8) s β Se 3/2−
As 33 49 81.9247387(40) 19.1(5) s β Se (2−)
As 131.6(5) keV 13.6(4) s β Se (5-)
As 33 50 82.9252069(30) 13.4(4) s β Se 5/2−#
As 33 51 83.9293033(34) 3.16(58) s β (99.72%) Se (2−)
β, n (.28%) Se
As 33 52 84.9321637(33) 2.022(7) s β, n (62.6%) Se (5/2−)
β (37.4%) Se
As 33 53 85.9367015(37) 945(8) ms β (64.5%) Se (1−,2−)
β, n (35.5%) Se
β, 2n? Se
As 33 54 86.9402917(32) 492(25) ms β (84.6%) Se (5/2−,3/2−)
β, n (15.4%) Se
β, 2n? Se
As 33 55 87.94584(22)# 270(150) ms β Se
β, n? Se
As 33 56 88.95005(32)# 220# ms β? Se 5/2−#
β, n? Se
β, 2n? Se
As 33 57 89.95600(43)# 70# ms β? Se
β, n? Se
β, 2n? Se
As 124.5(5) keV 220(100) ns IT As
As 33 58 90.96082(43)# 100# ms β? Se 5/2−#
β, n? Se
β, 2n? Se
As 33 59 91.96739(54)# 45# ms β? Se
β, n? Se
β, 2n? Se
As 33 60
As 33 61
As 33 62
This table header & footer:
  1. As – Excited nuclear isomer.
  2. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. Modes of decay:
    EC: Electron capture


    n: Neutron emission
    p: Proton emission
  5. Bold italics symbol as daughter – Daughter product is nearly stable.
  6. Bold symbol as daughter – Daughter product is stable.
  7. ( ) spin value – Indicates spin with weak assignment arguments.
  8. ^ # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

References

  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. "Standard Atomic Weights: Arsenic". CIAAW. 2013.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  4. Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
  5. ^ Shimizu, Y.; Kubo, T.; Sumikama, T.; Fukuda, N.; Takeda, H.; Suzuki, H.; Ahn, D. S.; Inabe, N.; Kusaka, K.; Ohtake, M.; Yanagisawa, Y.; Yoshida, K.; Ichikawa, Y.; Isobe, T.; Otsu, H.; Sato, H.; Sonoda, T.; Murai, D.; Iwasa, N.; Imai, N.; Hirayama, Y.; Jeong, S. C.; Kimura, S.; Miyatake, H.; Mukai, M.; Kim, D. G.; Kim, E.; Yagi, A. (8 April 2024). "Production of new neutron-rich isotopes near the N = 60 isotones Ge 92 and As 93 by in-flight fission of a 345 MeV/nucleon U 238 beam". Physical Review C. 109 (4). doi:10.1103/PhysRevC.109.044313.
Isotopes of the chemical elements
Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period Hydrogen and
alkali metals 		Alkaline
earth metals 		Pnicto­gens Chal­co­gens Halo­gens Noble gases
① Isotopes § ListH1 Isotopes § ListHe2
② Isotopes § ListLi3 Isotopes § ListBe4 Isotopes § ListB5 Isotopes § ListC6 Isotopes § ListN7 Isotopes § ListO8 Isotopes § ListF9 Isotopes § ListNe10
③ Isotopes § ListNa11 Isotopes § ListMg12 Isotopes § ListAl13 Isotopes § ListSi14 Isotopes § ListP15 Isotopes § ListS16 Isotopes § ListCl17 Isotopes § ListAr18
④ Isotopes § ListK19 Isotopes § ListCa20 Isotopes § ListSc21 Isotopes § ListTi22 Isotopes § ListV23 Isotopes § ListCr24 Isotopes § ListMn25 Isotopes § ListFe26 Isotopes § ListCo27 Isotopes § ListNi28 Isotopes § ListCu29 Isotopes § ListZn30 Isotopes § ListGa31 Isotopes § ListGe32 Isotopes § ListAs33 Isotopes § ListSe34 Isotopes § ListBr35 Isotopes § ListKr36
⑤ Isotopes § ListRb37 Isotopes § ListSr38 Isotopes § ListY39 Isotopes § ListZr40 Isotopes § ListNb41 Isotopes § ListMo42 Isotopes § ListTc43 Isotopes § ListRu44 Isotopes § ListRh45 Isotopes § ListPd46 Isotopes § ListAg47 Isotopes § ListCd48 Isotopes § ListIn49 Isotopes § ListSn50 Isotopes § ListSb51 Isotopes § ListTe52 Isotopes § ListI53 Isotopes § ListXe54
⑥ Isotopes § ListCs55 Isotopes § ListBa56 1 asterisk Isotopes § ListLu71 Isotopes § ListHf72 Isotopes § ListTa73 Isotopes § ListW74 Isotopes § ListRe75 Isotopes § ListOs76 Isotopes § ListIr77 Isotopes § ListPt78 Isotopes § ListAu79 Isotopes § ListHg80 Isotopes § ListTl81 Isotopes § ListPb82 Isotopes § ListBi83 Isotopes § ListPo84 Isotopes § ListAt85 Isotopes § ListRn86
⑦ Isotopes § ListFr87 Isotopes § ListRa88 1 asterisk Isotopes § ListLr103 Isotopes § ListRf104 Isotopes § ListDb105 Isotopes § ListSg106 Isotopes § ListBh107 Isotopes § ListHs108 Isotopes § ListMt109 Isotopes § ListDs110 Isotopes § ListRg111 Isotopes § ListCn112 Isotopes § ListNh113 Isotopes § ListFl114 Isotopes § ListMc115 Isotopes § ListLv116 Isotopes § ListTs117 Isotopes § ListOg118
⑧ Isotopes § ListUue119 Isotopes § ListUbn120
1 asterisk Isotopes § ListLa57 Isotopes § ListCe58 Isotopes § ListPr59 Isotopes § ListNd60 Isotopes § ListPm61 Isotopes § ListSm62 Isotopes § ListEu63 Isotopes § ListGd64 Isotopes § ListTb65 Isotopes § ListDy66 Isotopes § ListHo67 Isotopes § ListEr68 Isotopes § ListTm69 Isotopes § ListYb70  
1 asterisk Isotopes § ListAc89 Isotopes § ListTh90 Isotopes § ListPa91 Isotopes § ListU92 Isotopes § ListNp93 Isotopes § ListPu94 Isotopes § ListAm95 Isotopes § ListCm96 Isotopes § ListBk97 Isotopes § ListCf98 Isotopes § ListEs99 Isotopes § ListFm100 Isotopes § ListMd101 Isotopes § ListNo102
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