lanthanoid atom lutetium atom 0 174.94078 174.96700 71Lu CAS:7439-94-3 CHEBI:33382 Cassiopeium Gmelin:16202 InChI=1S/Lu Lu Lu OHSVLFRHMCKCQY-UHFFFAOYSA-N WebElements:Lu [Lu] cassiopium chebi_ontology lutecium lutetium lutetium lutezio Lutetium lutecio 镥 lutécium lutecio Lutetium d-block element atom