Predict the electron configuration exception for gold (Au) based on the behavior of copper and silver.

• A. Gold will promote an electron from the 6p orbital to the 5d orbital, resulting in 6s² 5d¹⁰.
• B. Gold will promote an electron from the 6s orbital to the 5d orbital, resulting in 6s¹ 5d¹⁰.
• C. Gold will not promote any electrons, resulting in 6s² 5d⁹.
• D. Gold will promote an electron from the 5d orbital to the 6s orbital, resulting in 6s² 5d⁹.

Answer: (B)