Question

Why elements are divided into blocks?

Answer 1

Answer:

A block of the periodic table is a set of elements unified by the orbitals their valence electrons or vacancies lie in. The term appears to have been first used by Charles Janet. Each block is named after its characteristic orbital: s-block, p-block, d-block, and f-block.

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Answer 2

Explanation:

So that they are easy to identify

and they are set at their places according to their Valencies and atomic masses