Give any five characteristic properties of inner transition elements.

Explanation

Characteristics of f- block elements :
(i) The elements in which the last electron enters in f- orbital are called f- block elements.
(ii) This block consist of 4f block elements and 5f block elements.
Lanthanoid series `(4f)_(58)Ce_(71)^(-)Lu`
Actinoid series `(5f)_(90)Th-_(103)Lr`
(iii) Their general electronic configuration is (n-2)
`f^(1-14)(n-1)d^(0-1)ns^(2)`.
Lanthanoid `-4f^(1-14)5d^(0-1)6s^(2)`
Actinoid `-5^(1-14)6d^(0-1)7s^(2)`