mercury(IV) fluoride
...that mercury(IV) fluoride , the first mercury compound ever to have an oxidation state of 4, was synthesized at 4 degrees above absolute zero?
...that <b id="mwCTg"><a href="./Mercury(IV)_fluoride" id="mwCTk" rel="mw:WikiLink" title="Mercury(IV) fluoride">mercury(IV) fluoride</a></b> <i id="mwCTo">(model pictured)</i>, the first <a class="mw-disambig" href="./Mercury" id="mwCTs" rel="mw:WikiLink" title="Mercury">mercury</a> compound ever to have an <a href="./Oxidation_state" id="mwCTw" rel="mw:WikiLink" title="Oxidation state">oxidation state</a> of 4, was synthesized at 4 degrees above <a href="./Absolute_zero" id="mwCT0" rel="mw:WikiLink" title="Absolute zero">absolute zero</a>?