Nintendium - The 133rd element

Nintendium (Nn) is the 133rd element, first discovered by Nintendo and has, up until now, been kept a secret. It is a mysterious metal, as it appears that all its common isotopes last a very long time, as well as one being completely stable. It appears to commonly bond with nearly anything, and certain bonds of it with Beryllium and Selenium create a tough, plastic-like material named Nintendium Beryselecate.