View source for Physics:Isotopes of arsenic

{{Short description|Nuclides with atomic number of 33 but with different mass numbers}}
{{Infobox arsenic isotopes}}
[[Chemistry:Arsenic|Arsenic]] (<sub>33</sub>As) has 33 known [[Physics:Isotope|isotope]]s and at least 10 [[Physics:Nuclear isomer|isomers]]. Only one of these isotopes, <sup>75</sup>As, is stable; as such, it is considered a [[Monoisotopic element|monoisotopic element]]. The longest-lived radioisotope is <sup>73</sup>As with a half-life of 80 days. Arsenic has been proposed as a "salting" material for [[Engineering:Nuclear weapon|nuclear weapon]]s ([[Chemistry:Cobalt|cobalt]] is another, better-known salting material). A jacket of <sup>75</sup>As, irradiated by the intense high-energy neutron flux from an exploding [[Engineering:Thermonuclear weapon|thermonuclear weapon]], would transmute into the radioactive isotope <sup>76</sup>As with a [[Physics:Half-life|half-life]] of 1.0778 days and produce approximately 1.13&nbsp;[[Physics:MeV|MeV]] [[Physics:Gamma ray|gamma radiation]], significantly increasing the radioactivity of the weapon's [[Physics:Nuclear fallout|fallout]] for several hours.{{Citation needed|date=February 2007}} Such a weapon is not known to have ever been built, tested, or used.{{Citation needed|date=February 2007}}

Transmutation of [[Chemistry:Arsenic|arsenic]] to much less toxic selenium could prevent cycling of arsenic, from groundwater to waterways to oceans and back via [[Biology:Sargassum|Sargassum]] seaweeds. [[Earth:Bioremediation|Bioremediation]] can provide a large supply of arsenic and rid aquifers of persistent poisoning issues.

== List of isotopes ==
{{Isotopes table
|symbol=As
|refs=<!-- not NUBASE2016 yet (2019-07-14) -->
|notes=m, unc(), mass#, exen#, spin(), spin#, daughter-nst, daughter-st, EC, n, p
}}
|-
| <sup>60</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 27
| 59.99313(64)#
|
| [[Physics:Proton emission|p]]
| <sup>59</sup>Ge
| 5+#
|
|
|-
| <sup>61</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 28
| 60.98062(64)#
|
| p
| <sup>60</sup>Ge
| 3/2−#
|
|
|-
| <sup>62</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 29
| 61.97320(32)#
|
| p
| <sup>61</sup>Ge
| 1+#
|
|
|-
| <sup>63</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 30
| 62.96369(54)#
|
| p
| <sup>62</sup>Ge
| (3/2−)#
|
|
|-
| <sup>64</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 31
| 63.95757(38)#
| 40(30)&nbsp;ms<br>[18(+43-7)&nbsp;ms]
| [[Physics:Beta decay|β<sup>+</sup>]]
| <sup>64</sup>Ge
| 0+#
|
|
|-
| <sup>65</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 32
| 64.94956(32)#
| 170(30)&nbsp;ms
| β<sup>+</sup>
| <sup>65</sup>Ge
| 3/2−#
|
|
|-
| <sup>66</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 33
| 65.94471(73)
| 95.77(23)&nbsp;ms
| β<sup>+</sup>
| <sup>66</sup>Ge
| (0+)
|
|
|-
| style="text-indent:1em" | <sup>66m1</sup>As
| colspan="3" style="text-indent:2em" | 1356.70(17)&nbsp;keV
| 1.1(1)&nbsp;µs
|
|
| (5+)
|
|
|-
| style="text-indent:1em" | <sup>66m2</sup>As
| colspan="3" style="text-indent:2em" | 3023.9(3)&nbsp;keV
| 8.2(5)&nbsp;µs
|
|
| (9+)
|
|
|-
| <sup>67</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 34
| 66.93919(11)
| 42.5(12)&nbsp;s
| β<sup>+</sup>
| <sup>67</sup>Ge
| (5/2−)
|
|
|-
| <sup>68</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 35
| 67.93677(5)
| 151.6(8)&nbsp;s
| β<sup>+</sup>
| <sup>68</sup>Ge
| 3+
|
|
|-
| style="text-indent:1em" | <sup>68m</sup>As
| colspan="3" style="text-indent:2em" | 425.21(16)&nbsp;keV
| 111(20)&nbsp;ns<br>[?107(+23-16)&nbsp;ns]
|
|
| 1+
|
|
|-
| <sup>69</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 36
| 68.93227(3)
| 15.2(2)&nbsp;min
| β<sup>+</sup>
| <sup>69</sup>Ge
| 5/2−
|
|
|-
| <sup>70</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 37
| 69.93092(5)
| 52.6(3)&nbsp;min
| β<sup>+</sup>
| '''<sup>70</sup>Ge'''
| 4(+#)
|
|
|-
| style="text-indent:1em" | <sup>70m</sup>As
| colspan="3" style="text-indent:2em" | 32.008(23)&nbsp;keV
| 96(3)&nbsp;µs
|
|
| 2(+)
|
|
|-
| <sup>71</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 38
| 70.927112(5)
| 65.28(15)&nbsp;h
| β<sup>+</sup>
| <sup>71</sup>Ge
| 5/2−
|
|
|-
| <sup>72</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 39
| 71.926752(5)
| 26.0(1)&nbsp;h
| β<sup>+</sup>
| '''<sup>72</sup>Ge'''
| 2−
|
|
|-
| <sup>73</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 40
| 72.923825(4)
| 80.30(6)&nbsp;d
| [[Physics:Electron capture|EC]]
| '''<sup>73</sup>Ge'''
| 3/2−
|
|
|-
| rowspan=2|<sup>74</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 41
| rowspan=2|73.9239287(25)
| rowspan=2|17.77(2)&nbsp;d
| β<sup>+</sup> (66%)
| '''<sup>74</sup>Ge'''
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| β<sup>−</sup> (34%)
| '''<sup>74</sup>Se'''
|-
| <sup>75</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 42
| 74.9215965(20)
| colspan=3 align=center|'''Stable'''
| 3/2−
| 1.0000
|
|-
| style="text-indent:1em" | <sup>75m</sup>As
| colspan="3" style="text-indent:2em" | 303.9241(7)&nbsp;keV
| 17.62(23)&nbsp;ms
|
|
| 9/2+
|
|
|-
| rowspan=2|<sup>76</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 43
| rowspan=2|75.922394(2)
| rowspan=2|1.0942(7)&nbsp;d
| β<sup>−</sup> (99.98%)
| '''<sup>76</sup>Se'''
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| EC (.02%)
| '''''<sup>76</sup>Ge'''''
|-
| style="text-indent:1em" | <sup>76m</sup>As
| colspan="3" style="text-indent:2em" | 44.425(1)&nbsp;keV
| 1.84(6)&nbsp;µs
|
|
| (1)+
|
|
|-
| <sup>77</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 44
| 76.9206473(25)
| 38.83(5)&nbsp;h
| β<sup>−</sup>
| <sup>77m</sup>Se
| 3/2−
|
|
|-
| style="text-indent:1em" | <sup>77m</sup>As
| colspan="3" style="text-indent:2em" | 475.443(16)&nbsp;keV
| 114.0(25)&nbsp;µs
|
|
| 9/2+
|
|
|-
| <sup>78</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 45
| 77.921827(11)
| 90.7(2)&nbsp;min
| β<sup>−</sup>
| '''<sup>78</sup>Se'''
| 2−
|
|
|-
| <sup>79</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 46
| 78.920948(6)
| 9.01(15)&nbsp;min
| β<sup>−</sup>
| <sup>79m</sup>Se
| 3/2−
|
|
|-
| style="text-indent:1em" | <sup>79m</sup>As
| colspan="3" style="text-indent:2em" | 772.81(6)&nbsp;keV
| 1.21(1)&nbsp;µs
|
|
| (9/2)+
|
|
|-
| <sup>80</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 47
| 79.922534(25)
| 15.2(2)&nbsp;s
| β<sup>−</sup>
| '''<sup>80</sup>Se'''
| 1+
|
|
|-
| <sup>81</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 48
| 80.922132(6)
| 33.3(8)&nbsp;s
| β<sup>−</sup>
| <sup>81m</sup>Se
| 3/2−
|
|
|-
| <sup>82</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 49
| 81.92450(21)
| 19.1(5)&nbsp;s
| β<sup>−</sup>
| '''''<sup>82</sup>Se'''''
| (1+)
|
|
|-
| style="text-indent:1em" | <sup>82m</sup>As
| colspan="3" style="text-indent:2em" | 250(200) keV
| 13.6(4)&nbsp;s
| β<sup>−</sup>
| '''''<sup>82</sup>Se'''''
| (5-)
|
|
|-
| <sup>83</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 50
| 82.92498(24)
| 13.4(3)&nbsp;s
| β<sup>−</sup>
| <sup>83m</sup>Se
| 3/2−#
|
|
|-
| rowspan=2|<sup>84</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 51
| rowspan=2|83.92906(32)#
| rowspan=2|4.02(3)&nbsp;s
| β<sup>−</sup> (99.721%)
| <sup>84</sup>Se
| rowspan=2|(3)(+#)
| rowspan=2|
| rowspan=2|
|-
| β<sup>−</sup>, [[Physics:Neutron emission|n]] (.279%)
| <sup>83</sup>Se
|-
| style="text-indent:1em" | <sup>84m</sup>As
| colspan="3" style="text-indent:2em" | 0(100)# keV
| 650(150)&nbsp;ms
|
|
|
|
|
|-
| rowspan=2|<sup>85</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 52
| rowspan=2|84.93202(21)#
| rowspan=2|2.021(10)&nbsp;s
| β<sup>−</sup>, n (59.4%)
| <sup>84</sup>Se
| rowspan=2|(3/2−)#
| rowspan=2| 
| rowspan=2|
|-
| β<sup>−</sup> (40.6%)
| <sup>85</sup>Se
|-
| rowspan=2|<sup>86</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 53
| rowspan=2|85.93650(32)#
| rowspan=2|0.945(8)&nbsp;s
| β<sup>−</sup> (67%)
| <sup>86</sup>Se
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>−</sup>, n (33%)
| <sup>85</sup>Se
|-
| rowspan=2|<sup>87</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 54
| rowspan=2|86.93990(32)#
| rowspan=2|0.56(8)&nbsp;s
| β<sup>−</sup> (84.6%)
| <sup>87</sup>Se
| rowspan=2|3/2−#
| rowspan=2|
| rowspan=2|
|-
| β<sup>−</sup>, n (15.4%)
| <sup>86</sup>Se
|-
| rowspan=2|<sup>88</sup>As
| rowspan=2 style="text-align:right" | 33
| rowspan=2 style="text-align:right" | 55
| rowspan=2|87.94494(54)#
| rowspan=2|300#&nbsp;ms<br>[>300&nbsp;ns]
| β<sup>−</sup>
| <sup>88</sup>Se
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>−</sup>, n
| <sup>87</sup>Se
|-
| <sup>89</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 56
| 88.94939(54)#
| 200#&nbsp;ms<br>[>300&nbsp;ns]
| β<sup>−</sup>
| <sup>89</sup>Se
| 3/2−#
|
|
|-
| <sup>90</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 57
| 89.95550(86)#
| 80#&nbsp;ms<br>[>300&nbsp;ns]
|
|
|
|
|
|-
| <sup>91</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 58
| 90.96043(97)#
| 50#&nbsp;ms<br>[>300&nbsp;ns]
|
|
| 3/2−#
|
|
|-
| <sup>92</sup>As
| style="text-align:right" | 33
| style="text-align:right" | 59
| 91.96680(97)#
| 30#&nbsp;ms<br>[>300&nbsp;ns]
|
|
|
|
|
{{Isotopes table/footer}}

== References ==
{{Reflist}}
* Isotope masses from:
**{{NUBASE 2003}}
* Isotopic compositions and standard atomic masses from:
**{{CIAAW 2005}}
* Half-life, spin, and isomer data selected from the following sources.
**{{NUBASE 2003}}
**{{NNDC}}
**{{CRC85|chapter=11}}
* A.Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. ''Discovery of the Arsenic Isotopes.'' [https://arxiv.org/abs/0902.4361 arXiv:0902.4361].

==External links==

{{Navbox element isotopes}}

[[Category:Isotopes of arsenic| ]]
[[Category:Lists of isotopes by element|Arsenic]]

{{Sourceattribution|Isotopes of arsenic}}