HgI2 (with the '2' small subscript - ie below the line)
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The chemical formula for mercury(II) nitrate is Hg(NO3)2.
The chemical formula for iron(II) iodide is FeI2. It consists of one iron (Fe) ion with a +2 charge and two iodine (I) ions with a -1 charge each.
Sodium + Iodine ----> Sodium Iodide2 Na + I2 ----> 2 NaI
Copper iodide is a chemical compound composed of copper and iodine atoms. Its chemical formula is CuI.
The chemical formula for mercury(II) dichromate is HgCr2O7.