Similar to p-block elements, d and f-block elements are found in nature and included in the periodic table.
D-block ranges from groups 3 to 12 and starts with the 4th period. They are transition elements, between the highly electropositive elements in groups 1 and 2 and the weakly electropositive elements of groups 13 to 16.
The f-block elements usually appear as a footnote in the standard 18-column periodic table and contain metals of periods 6 and 7. All of these topics are elaborated in 12th chemistry NCERT PDF.
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