"300380497" . . . "2013-03-21T14:51:04"^^ . "2014-02-26T11:32:42"^^ . . "Ce (cerium)"@en . "cerium"@en . "Metallic element having symbol Ce and atomic number 58; a gray, ductile metal, a lanthanite, cerium is the most abundant of the rare-earth group."@en .