The high activity of fluorine is due to its …. Dissociation energy

Answer

To solve the question regarding the high activity of fluorine and its dissociation energy, we can break down the reasoning into several steps:

### Step-by-Step Solution:

1. **Understanding Fluorine's Activity**:
- Fluorine is known to be the most reactive element in the periodic table. Its high reactivity is a key characteristic that we need to explain.

2. **Dissociation Energy**:
- Dissociation energy refers to the energy required to break the bond between two atoms in a molecule. In the case of diatomic fluorine (F₂), we are interested in the energy needed to break the F-F bond.

3. **Fluorine's Bond Characteristics**:
- The bond between two fluorine atoms is relatively weak compared to other halogens. This is due to the small size of the fluorine atom, which leads to significant repulsion between the lone pairs of electrons present on each fluorine atom.

4. **Electronegativity**:
- Fluorine is the most electronegative element, which means it has a strong tendency to attract electrons. This high electronegativity contributes to its reactivity.

5. **Conclusion**:
- The high activity of fluorine is due to its low dissociation energy. The weak F-F bond allows fluorine to easily react with other elements, making it highly reactive.

### Final Answer:
The high activity of fluorine is due to its **low dissociation energy**.

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