Tags: Chemical Compound, Chemical Substance.
Mercury(IV) fluoride HgF4 is the first mercury compound to be discovered with mercury in the oxidation state IV. Mercury like the other group 12 elements (cadmium and zinc) has an s2d10 electron configuration and generally only forms bonds involving its s orbital. This means that the highest oxidation state mercury normally attains is II and for this reason it is usually considered a post-transition metal instead of a transition metal.
