chalcogen polonium atom 0 209.00000 209.00000 84Po A radioactive metallic element discovered in 1898 by Marie Sklodowska Curie and named after her home country, Poland (Latin Polonia). CAS:7440-08-6 CHEBI:33313 Gmelin:40435 HZEBHPIOVYHPMT-UHFFFAOYSA-N InChI=1S/Po Po Po WebElements:Po [Po] chebi_ontology polonio polonio polonium Polonium 钋 polonium polonio polonium metal atom