Cerium is a reactive, soft, gray, lustrous [[metal]] that is malleable and [[ductile]].<ref>http://www.chemicool.com/elements/cerium.html</ref> It is also somewhat flammable.<ref>http://education.jlab.org/itselemental/ele058.html</ref> | Cerium is a reactive, soft, gray, lustrous [[metal]] that is malleable and [[ductile]].<ref>http://www.chemicool.com/elements/cerium.html</ref> It is also somewhat flammable.<ref>http://education.jlab.org/itselemental/ele058.html</ref> |