GKFix MCQ Question

What is the electronic configuration of the element with atomic number 61 (Promethium)?

• A. [Xe] 4f^4 6s^2
• B. [Xe] 4f^6 6s^2
• C. [Xe] 4f^5 5d^1 6s^1
• D. [Xe] 4f^5 6s^2