Fluorine is a strong oxidising agent because:
(a) it has several isotopes
(b) it is very small and has 7 electrons in valency shell
(c) its valency is one
(d) it is the first member of the halogen series
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(b) Due to smallest halogen, it possesses maximum tendency for accepting electron in aqueous medium.
(1/2) F2+e+aq →F-, ∆H=-ve(max.for F2)