Question

how are the elements classified into four blocks s, p, d, f? what are representative elements

Answer 1

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In addition to His answer..

The elements belonging to group I and II (the s-block elements) and the elements belonging to group 13, 14, 15, 16, 17 and 18 ( the p-block elements) together are known as the representative elements. These elements occur on both the sides of the periodic table and display the periodic trends most effectively.