GKFix MCQ Question

What is the ground state electronic configuration of Iridium (Ir, Z=77)?

• A. [Xe] 4f¹⁴ 5d⁹
• B. [Xe] 4f¹⁴ 5d⁶ 6s³
• C. [Xe] 4f¹⁴ 5d⁸ 6s¹
• D. [Xe] 4f¹⁴ 5d⁷ 6s²