THE LANTHANIDES AND ACTINIDES ARE LOCATED IN WHICH BLOCK OF THE PERIODIC TABLE

• A. P-block
• B. S-block
• C. F-block ✓
• D. D-block

The answer to the question is: C. F-block

The lanthanides and actinides are located in the f-block of the periodic table. These two series of elements are often referred to as the inner transition metals. The lanthanides consist of elements with atomic numbers 57 to 71, while the actinides consist of elements with atomic numbers 89 to 103. These elements are placed below the main body of the periodic table to keep it compact, as including them would make the table significantly wider.

The f-block elements have unique electron configurations due to the filling of their f-orbitals. This results in their placement outside of the main body of the periodic table, in what is known as the f-block. The lanthanides and actinides exhibit similar chemical properties within their respective series due to the gradual filling of their f-orbitals.