What isotope of Arsenic is most common in the universe? Why?

Arsenic (33As) has 33 known isotopes and at least 10 isomers. Only one of these isotopes, 75As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73As has a half-life of 80 days.

Explanation:

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not sure if this what   you'r looking for would be percent composition