5. PhysicalProperties(Lanthanides)-
*These “rare-earth” elements are not
necessarily rare.
*Soft white metals with poor
conductivity
*Found in the earth as phosphate or
oxide compounds.
*Exist mostly in +3 oxidation state with
Ce(IV) and Eu(II) as exceptions.
6. PhysicalProperties(Actinides)-
*Actinides have non-uniform oxidation states.
*Actinides are unstable,rare,and often
times too toxic to handle.
*ThoriumandUranium have comparably low
levels of radioactivity and their
properties are well known.