Wikipedia definition
1. Isotopes of sulfurSulfur (S) has 25 known isotopes with mass numbers ranging from 26 to 49, four of which are stable: S (95.02%), S (0.75%), S (4.21%), and S (0.02%). The preponderance of sulfur-32 is explained by its production from carbon-12 plus successive fusion capture of five helium nuclei, in the so-called alpha process of exploding type II supernovae. Other than S, the radioactive isotopes of sulfur are all comparatively short-lived. S is formed from cosmic ray spallation of Ar in the atmosphere.
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