vanadium group element atom tantalum atom 0 180.94790 180.94800 73Ta CAS:7440-25-7 CHEBI:33348 GUVRBAGPIYLISA-UHFFFAOYSA-N InChI=1S/Ta Ta Ta WebElements:Ta [Ta] chebi_ontology tantalo tantalum tantalum tantale tántalo 钽 tantale Tantal tantalio Tantal