Admantium?

As a Chemist, I have to give the makers of this shirt (I still bought it ;-) ) a hard time. Element 119 would fall into the Group 1A elements (Hydrogen, Lithium, Sodium, Potassium) and well that just doesn't speak to me. Adamantium shouldn't be an Alkali metal. How about we put it in as a rare earth metal like the one below Uranium (142?). Of course it is all moot, anything beyond 94 is synthetically made and typically don't last all that long so unless elements find some stability adamantium shouldn't exist!