The correct formula unit for the ionic compound mercuric fluoride is e. HgF2.
In mercuric fluoride, "mercuric" indicates that mercury has a +2 oxidation state (Hg²⁺), and each fluoride ion (F⁻) has a -1 charge. To balance the charges, two fluoride ions are needed for each mercury ion, resulting in the formula HgF2.
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