Why zinc metal and `Zn^(++)` ions are diamagnetic?

Explanation

To understand why zinc metal and Zn²⁺ ions are diamagnetic, we need to analyze their electronic configurations and the presence of unpaired electrons.

### Step-by-Step Solution:

1. **Identify the Electronic Configuration of Zinc (Zn):**
- The atomic number of zinc is 30. Therefore, its electronic configuration is:
\[
\text{Zn: } [\text{Ar}] 4s^2 3d^{10}
...