It uses material from the Wikipedia article "Isotopes_of_arsenic". A list of authors is available in Wikipedia. Isotopes of arsenic Although arsenic (As) has multiple isotopes, only one of these isotopes is stable; as such, it is considered a monoisotopic element.

Arsenic (33 As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, 75 As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73 As with a half-life of 80 days. β +, p? β +, p? 3023. (3) keV β −, 2n? β −, 2n? β −, n? β −? β −, n? β −, 2n? β −? β −, n? β −, 2n? β −? β −, n? β −, 2n?

List, data and properties of all known isotopes of Arsenic. All atomic nuclei of the chemical element arsenic are summarized under arsenic isotopes; these consist of an atomic nucleus with 33 protons and, in the uncharged state, 33 electrons. The difference between the individual arsenic isotopes is due to the number of neutrons in the nucleus.

Isotopes that are lighter than the stable 75 As tend to decay by β + decay, and those that are heavier tend to decay by β − decay, with some exceptions. At least 10 nuclear isomers have been described, ranging in atomic mass from 66 to 84. The most stable of arsenic's isomers is 68m As with a half-life of 111 seconds.