___forms no compounds or ions, in which it has a positive oxidation number.

F

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C l

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B r

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I

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A t

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Solution

The correct option is A $F$
Fluorine is the most electronegative element of all. Its electronegativity is around $4$ . For Fluorine to have a positive oxidation number, an element whose electronegativity is even higher than Fluorine must be attached to Fluorine. Which is strictly not possible, because Fluorine is the most electronegative of all. Thus. $F$ can never have a positive oxidation number.
Whereas, $C l$ or $I$ etc can have in $H C l O_{3}$ or $H I O_{3}$ where their oxidation numbers are $+ 5$ .
Option $A$ is the correct answer.

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