Reason for high reactivity of fluorine

Reason for high reactivity of fluorine

1. It has abnormally low (F-F) bond energy by comparison with other halogens (i.e., F₂, 158; Cl₂, 247; Br₂, 193; I₂, 151 kJ mol^-1).

The low (F-F) bond energy is probably due to   greater repulsion between nonbonding electrons.

2. Fluorine forms strong covalent bonds with other elements, e.g., C-F, 484; C-Cl, 338; C-Br, 276; C-I, 238 kJ mol^-1.
3. Fluorine has the highest electronegativity of all elements.

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