sulfur atom sulfur-35 atom CHEBI:37983 sulfur-35 34.96903 (35)16S 34.969 InChI=1S/S/i1+3 sulfur, isotope of mass 35 sulphur-35 The radioactive isotope of sulfur with relative atomic mass 34.9690322 and nuclear spin (3)/2. The longest-lived sulfur radionuclide with half-life of 87.5 days. sulfur-35 CAS:15117-53-0 0 chebi_ontology [35S] (35)S NINIDFKCEFEMDL-AKLPVKDBSA-N [35S]