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Naturally occurring arsenic is composed of one stable isotope, 75As.[11] As of 2003, at least 33 radioisotopes have also been synthesized, ranging in Atomic Mass from 60 to 92. The most stable of these is 73As with a half-life of 80.3 days. Isotopes that are lighter than the stable 75As 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 68mAs with a half-life of 111 seconds

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