I wanted to ask purely from a theoretical point of view what would happen if you were to combine Lanthanum Uranium and Radium together? I chose it as my project since it spells my name purely for comical reasons but since i can't find it anywhere i'm genuinely curious.
They will perhaps form an alloy. Depends on the atomic radii of the three elements (they need to be similar, you can check on wikipedia).
Or, if the radii are (suitably) dissimilar, you might get some sort of intermetallic phase (like e.g. brass).
However I seriously doubt that anyone has ever investigated the phase diagram of this specific ternary mixture. Radium is just too radioactive for most people to care.
(You might have suspected this, with three metals: There will be no interesting reaction. :-/)