Types of elements : s,p , d and f block elements

What are s,p,d and f block elements ?

Write an essay on the division of elements into s, p, d and f - blocks.

Describe the main characteristic properties of s, p, d and f-block elements.

What are 'd' and 'f' block elements ?

Explain how the elements are classified into s,p,d, and f - block elements in the periodic table and give the advantages of this kind of classification