Chemistry

Question Analysis
This question tests the student's understanding of the electron loss order in transition metals and the resulting ion configuration.

Key Concept Explanation
In transition metals, the 4s electrons are lost before the 3d electrons when forming ions. For Cu²⁺, the 4s electron is lost first, followed by one 3d electron.

Step-by-step Solution
1. Determine the neutral copper (Cu) electron configuration: [Ar] 4s¹ 3d¹⁰.
2. Identify the electron loss order: 4s first, then 3d.
3. Cu²...