Question Detail
Question
What is the electron configuration of the Cu⁺ ion?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Copper atom (Cu) has the anomalous configuration [Ar] 3d¹⁰ 4s¹. When Cu loses one electron to form Cu⁺, the electron is removed from the 4s orbital first, leaving the configuration [Ar] 3d¹⁰. The 3d¹⁰ configuration is fully filled and stable.
Hint
Remember that for transition metals, electrons are removed from the ns orbital before the (n-1)d orbital when forming cations.