GKFix MCQ Question

What is a key difference in the electronic configurations of Lanthanoids and Actinoids?

• A. Lanthanoids fill the 5f orbitals, while actinoids fill the 4f orbitals.
• B. Lanthanoids primarily fill the 4f orbitals, while actinoids primarily fill the 5f orbitals.
• C. Lanthanoids fill the 4d orbitals, while actinoids fill the 5d orbitals.
• D. They have identical electronic configurations.