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Reference.org
Astatine iodide
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<p>Astatine iodide is an <a href="/facts/Interhalogen/TBED2c9B">interhalogen compound</a> with the chemical formula <a href="/facts/Astatine/AlbHPBK5">At</a><a href="/facts/Iodine/JlfMecMf">I</a>. It is the second heaviest known interhalogen compound, after <a href="/facts/Iodine_tribromide/wVxMVhHT">iodine tribromide</a>. </p>