Largest cluster of francium atoms made in a laboratory

In Dec 2002, scientists at the State University of
New York, USA, managed to create francium (Fr)
atoms using a heavy ion nuclear fusion reactor,
collecting more than 300,000 together in a
magneto-optical trap. Francium’s most stable
isotope has a half-life of just 22 min, making
it the most unstable naturally occurring
element. It has no practical uses.