<a href="https://en.wikipedia.org/wiki/Plutonium" id="mw3w" rel="mw:WikiLink" title="Plutonium">Plutonium</a> (specifically <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Pu-238" id="mw4A" rel="mw:WikiLink" title="Pu-238">Pu-238</a>) is first isolated at Berkeley, California.