The oxidation number of iodine varies from:

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(B) Iodine is a halogen belonging to group $17$ of the periodic table.Its valence shell configuration is $ns^2 np^5$.It can gain one electron to achie

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$-1$ to $+7$

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(B) Iodine is a halogen belonging to group $17$ of the periodic table.Its valence shell configuration is $ns^2 np^5$.It can gain one electron to achieve a stable noble gas configuration (oxidation state $-1$) or lose electrons from its valence shell (up to $7$ electrons) to exhibit positive oxidation states up to $+7$ in compounds with more electronegative elements like fluorine or oxygen (e.g.,$IF_7$ or $HIO_4$).Thus,the range of oxidation states for iodine is $-1$ to $+7$.

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