Flerovium

Flerovium is a synthetic, radioactive element in group 14, below lead. Experiments with individual atoms indicate that it is an unusually volatile and weakly reactive metal, with behavior that differs substantially from its lighter counterpart. These properties make flerovium useful for investigating how electron structure and relativistic effects alter the chemistry of superheavy elements. Its limited production and radioactive decay restrict its use to scientific research, and its bulk physical properties remain experimentally unestablished.