Question

Which of the following are called lanthanoids?

• A. s-block elements
• B. p-block elements
• C. d-block elements
• D. f-block elements

Answer 1

The Correct Option is D

Correct answer: f-block elements
 
Explanation:
Lanthanoids are a series of elements from atomic number 57 (Lanthanum) to 71 (Lutetium). These elements are placed in the f-block of the modern periodic table and are characterized by the filling of the 4f orbitals. 

- s-block elements: Include Group 1 and Group 2 elements.
- p-block elements: Include Groups 13 to 18.
- d-block elements: Are the transition metals, found in Groups 3 to 12.
- f-block elements: Include lanthanoids and actinoids. 
Therefore, lanthanoids belong to the f-block elements.