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No. Reactivity in group 17, the halogens, decreases as you move down the group. Since astatine is lower in the group than iodine, astatine is less reactive.

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Why does an aqueous solution of iodine not react with potassium chloride?

Iodine is not reactive with potassium chloride in an aqueous solution because iodine is less reactive than chlorine. Chlorine is more likely to react with potassium to form potassium chloride, leaving the iodine unreacted.


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