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Mercury(IV) fluoride
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<p>Mercury(IV) fluoride, HgF4, is a purported compound, the first to be reported with mercury in the +4 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a>. Mercury, like the other <a href="/facts/Group_12_element/z8aB00Ih">group 12 elements</a> (<a href="/facts/Cadmium/wXkV2eIX">cadmium</a> and <a href="/facts/Zinc/80b1qgk3">zinc</a>), has an s2d10 <a href="/facts/Electron_configuration/TQjRr22P">electron configuration</a> and generally only forms bonds involving its 6s orbital. This means that the highest oxidation state mercury normally attains is +2, and for this reason it is sometimes considered a <a href="/facts/Post-transition_metal/wjp3aeGn">post-transition metal</a> instead of a <a href="/facts/Transition_metal/0slGWoLQ">transition metal</a>. HgF4 was first reported from experiments in 2007, but its existence remains disputed; experiments conducted in 2008 could not replicate the compound. </p>