Write the condensed electron configuration for the element Copper (Cu).

• A. [Ar] 3d¹⁰ 4s¹
• B. [Ne] 3s² 3p⁶ 3d¹⁰ 4s¹
• C. [Ar] 3d⁹ 4s²
• D. [Kr] 4d¹⁰ 5s¹

Answer: (A)