berkelium
... that it took 340 days to prepare 22 milligrams of berkelium for the synthesis of 6 atoms of element 117, which took another 150 days?
... that it took 340 days to prepare 22 milligrams of <b id="mwAzE"><a href="./Berkelium" id="mwAzI" rel="mw:WikiLink" title="Berkelium">berkelium</a></b> <i id="mwAzM">(pictured)</i> for the synthesis of 6 atoms of <a class="mw-redirect" href="./Ununseptium" id="mwAzQ" rel="mw:WikiLink" title="Ununseptium">element 117</a>, which took another 150 days?