In the Mg-Al cell, the number of electrons involved in the cell reaction is.

Explanation

To determine the number of electrons involved in the Mg-Al cell reaction, we need to analyze the cell reaction and balance it properly.

### Step-by-Step Solution:

1. **Write the Cell Reaction**:
The reaction in the magnesium-aluminum cell can be written as:
\[
\text{Mg} + \text{Al}^{3+} \rightarrow \text{Mg}^{2+} + \text{Al}
...