Interpretation:
The reason for s-block of the periodic table has two groups wide, the p-block has six-groups wide and d-block has ten-groups wide needs to be explained.
Concept introduction:
Periodic table is a tabular

Answer to Problem 79A
In s- block, two groups are present alkali metals (group 1) and alkaline earth metals. In the periodic table Groups 13-18 elements are known as p block elements. The d- block elements are known as
Explanation of Solution
The s orbital can hold maximum number of two electrons. Hence, s block
consist of two groups IA and IIA. The p orbitals hold maximum two electrons, but there are three p orbitals. Hence, the maximum electrons are six and p block has six groups IIIA-VIIIA. The d orbitals hold maximum two electrons, but there are five d orbitals. Hence, the maximum electrons are 10 and it has ten groups IB-VIIIB (VIIIB contains three groups).
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