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Reactivity decreases. In other words, fluorine is the most reactive of the halogens while astatine is the lease reactive. This is because the ability to attract electrons(electronegativity) decreases as you go down the group.

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Q: What can you say about reactivity of the halogens as you go down the group from fluorine to astatine?
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the halogens decrease in reactivity as you move down the group, so i guess that the least reactive would be Astatine. Hope this helps =)

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