What is the electronic configuration of f block elements?

The general electronic configuration of f block elements is:

(n - 2)f¹–¹⁴ (n - 1)d⁰–¹ ns²

For example:

• Lanthanides (4f series): [Xe] 4f¹–¹⁴ 5d⁰–¹ 6s²
• Actinides (5f series): [Rn] 5f¹–¹⁴ 6d⁰–¹ 7s²

Key characteristics:

• Electrons are filled in the (n − 2)f orbitals
• These elements show variable oxidation states
• They are mostly metals with high density and conductivity

The filling of f-orbitals makes their electronic configuration complex compared to s and p block elements.