D And F Block Elements

These exhibit properties between those of s and p block elements.

All these elements are grouped as 3 d to 6 d series.

5 d series is comprised of all elements from $\mathrm{La}(\mathrm{Z}=57)$ to $\mathrm{Hg}(\mathrm{Z}=80)$.

Elements of 6 d series belongs to $7^{\text {th }}$ period of periodic table.