Question

on what basis the elements are divided in blocks in periodic table?

Answer 1

The periodic table is divided into four blocks that are called s, p, d, and f. Here is an explanation of each block: The s block makes up the first two columns of the periodic table. The elements in this block are all metals, and they react when water is present.

Answer 2

Elements in the long form of periodic table have been divided into four blocks i.e. s ,p ,d and f. This division is based upon the name of the orbitals which receives the last electron.