Why fluorine is most reactive?

Explanation

To understand why fluorine is the most reactive halogen, we can break down the explanation into several key points:

### Step-by-Step Solution:

1. **Identify the Halogens**:
- The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Among these, fluorine is the first element.

2. **Small Atomic Size**:
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