ununennium
... that ununennium is the element with the lowest atomic number that has not yet been synthesized?
... that <b id="mwBKg"><a href="./Ununennium" id="mwBKk" rel="mw:WikiLink" title="Ununennium">ununennium</a></b> is the element with the lowest <a href="./Atomic_number" id="mwBKo" rel="mw:WikiLink" title="Atomic number">atomic number</a> that has not yet been synthesized?