D-block elements are located in the center of the periodic table, specifically in groups 3 to 12. They are called transition metals because they occupy the d-orbital in their electron configuration.
Here’s a simple way to visualize it:
- Left of d-block: The s-block elements (Groups 1–2).
- Right of d-block: The p-block elements (Groups 13–18).
- Period range: Periods 4 to 7 mainly.
So, the d-block sits between the s-block and p-block, forming the “middle section” of the periodic table.