Flerovium is currently the heaviest element to have had its chemistry experimentally investigated, although the chemical investigations have so far not led to a conclusive result. Two experiments were performed in April–May 2007 in a joint FLNR-PSI collaboration aiming to study the chemistry of copernicium. The first experiment involved the reaction 242Pu(48Ca,3n)287Fl and the second the reaction 244Pu(48Ca,4n)288Fl: these reactions produce short-lived flerovium isotopes whose copernicium daughters would then be studied. The adsorption properties of the resultant atoms on a gold surface were compared with those of radon, as it was then expected that copernicium's full-shell electron configuration would lead to noble-gas like behaviour. Noble gases interact with metal surfaces very weakly, which is uncharacteristic of metals.