Nihonium

Nihonium is a synthetic, highly radioactive element. It was first reported in 2003 after being made by bombarding a bismuth target with zinc nuclei; subsequent experiments confirmed its production. Only a few atoms have been made, and known isotopes decay within seconds, so nihonium can be studied only in specialized experiments. Experiments suggest that it is not very volatile and is less reactive than thallium, while its expected metallic character and other bulk properties remain predictions rather than measured facts.