U=URANIUM
Uranium is a heavy, radioactive metal belonging to the actinide group. In pure form, it's a silver-gray metal, able to take a high polish, but it accumulates a dull oxidation layer after exposure to air.
Uranium is a heavy, radioactive metal belonging to the actinide group. In pure form, it's a silver-gray metal, able to take a high polish, but it accumulates a dull oxidation layer after exposure to air.