A molecule is unstable when the bond order is .. ..........or .............

Explanation

To determine when a molecule is unstable based on bond order, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bond Order**:
- Bond order is defined as the difference between the number of bonding electrons and the number of anti-bonding electrons, divided by two. The formula is:
\[
\text{Bond Order} = \frac{(\text{Number of Bonding Electrons} - \text{Number of Anti-bonding Electrons})}{2}
...