Its more complicated than that to build a bomb, but both Uranium-238 and Thorium-232 can be converted in Production Reactors to Weapons Grade fuel materiel.
Not just any metal. But if you want to transmute elements, you'll need a many-miles-long particle accelerator.
Metal + Tools = Weapons
tool + metal = weapon.
Become, adapt, commute, convert, fluctuate, evolve, innovate, metamorphose, mutate, transmute, regenerate, reform
tools+metal=weapon,weapon+human=hunter,hunter+weapon=warrior
tools+metal=weapon,weapon+human=hunter,hunter+weapon=warrior
My mom
Full Metal Alchemist
tools + metal =weapons; weapons + poison = poison weapon
Transmute them
The axe became a weapon in prehistoric (neolithic) times.(Things usually become weapons as soon as they are developed).
tools + metal = weapon