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Reference.org
Mercury(I) iodide
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<p>Mercury(I) iodide is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> of <a href="/facts/Mercury_(element)/WlxfoHva">mercury</a> and <a href="/facts/Iodine/JlfMecMf">iodine</a>. The chemical formula is Hg2I2. It is photosensitive and decomposes easily to mercury and <a href="/facts/Mercury(II)_iodide/3T73Agxs">HgI2</a>. </p>