Interpretation:
The different sections of the periodic table, name each of the section and the elements in each section needs to be determined.
Concept introduction:
Periodic table is a tabular

Answer to Problem 77A
Periodic table contains four blocks s, p, d and f.
Explanation of Solution
The periodic table is split into four blocks s, p, d and f. The diagram is given below:
In s- block, two groups are present alkali metals (group 1) and alkaline earth metals (group 2). Alkali metals contain one s electron in their outermost shell and alkaline earth metals contain two s electrons in their outermost shell.
Groups 13, 14, 15, 16, 17 and 18 elements are called p- block elements. Group 13 elements have two s- electrons and one p electron in their outer shell, Group 14 elements have four outer electrons, and similarly group 15, 16, 17 and 18 have 5, 6, 7 and 8 outer shell electrons respectively.
The d- block elements are known as
The f- block elements are composed into two sets lanthanides and actinides. They have filled f orbitals.
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