Copper (I) compounds are white and diamagnetic while copper(II) compounds are coloured and paramagnetic. Explain.

Explanation

To explain why Copper (I) compounds are white and diamagnetic while Copper (II) compounds are colored and paramagnetic, we need to analyze the electronic configurations of copper in both oxidation states and understand the implications of these configurations.

### Step-by-Step Solution:

1. **Identify the Atomic Number of Copper**:
- Copper (Cu) has an atomic number of 29. Its electronic configuration is:
\[
\text{Cu: } [\text{Ar}] 4s^1 3d^{10}
...