osmium atom 0 190.23000 191.96148 76Os CAS:7440-04-2 CHEBI:30687 Gmelin:16234 InChI=1S/Os Os Os SYQBFIAQOQZEGI-UHFFFAOYSA-N WebElements:Os [Os] chebi_ontology osmio osmium osmium osmio 锇 osmium Osmium osmio iron group element atom platinum group metal atom