IGNOU BCHCT 137 2026 - What is the general pattern of electronic configuration of the lanthan

Question

What is the general pattern of electronic configuration of the lanthanoids? Give the three exceptions to this.

10 Jan 2026

Answer :

Word Count : 245

The general electronic configuration of lanthanoids is characterized by the gradual filling of the 4f orbitals. Typically, lanthanoids have the outer electronic configuration [Xe] 6s² 4f¹⁻¹⁴, where the 4f subshell progressively fills across the series from lanthanum (La) to lutetium (Lu). In most cases, the 5d orbital remains unoccupied in the ground state, and the 4f electrons are added one by one, leading to the general pattern [Xe] 6s² 4f^n, where n ranges from

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