The d-and f-Block Elements

• The d-block elements are known as transition metals.

• The f-block elements are known as inner transition metals.

• 4f – metals → lanthanoids

• 5f – metals → actinoids

Electronic Configuration

• General outer electronic configuration is (n −1)d¹⁻¹⁰ ns¹⁻².

Zn, Cd, and Hg are not regarded as transition elements.

Reason − The orbitals of these elements are completely-filled. [Electronic configuration is (n − 1) d¹⁰ ns²]

The d-block elements (transition metals):

• The d-block elements (group 3 – 12) occupy the large, middle section of the periodic table.

• In general, t…