Final answer:
The subject of this question is Chemistry. The question is referring to a radioactive metal with silver white, lustrous properties. The metal's oxide is used as fuel in nuclear power plants and in atomic warheads.
Step-by-step explanation:
The subject of this question is Chemistry.
The question is referring to a radioactive metal with silver white, lustrous properties. The metal's oxide is used as fuel in nuclear power plants and in atomic warheads.