The document discusses the physical properties of f-block elements, which include the lanthanides and actinides. It notes that lanthanides are soft white metals found as phosphates or oxides, mostly in the +3 oxidation state with some exceptions. It also states that actinides have non-uniform oxidation states, are unstable and rare, and can be too toxic to handle safely, though thorium and uranium are less radioactive and better understood.

1. SONALGUPTA-
X-F-ROLL NO-40

4. F-block elements contain elements
from
58-71 and 90-103

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.