zirconium atom WebElements:Zr CHEBI:33342 zirconium 89.90470 QCWXUUIWCKQGHC-UHFFFAOYSA-N CAS:7440-67-7 Zr zirconium chebi_ontology 91.22400 circonio InChI=1S/Zr Zirkonium 40Zr 0 zirconio [Zr] Zr titanium group element atom