Uranium
Thorium
Plutonium
Zirconium
Answer is Right!
Answer is Wrong!
The correct answer is D. Zirconium.
Uranium, thorium, and plutonium are all radioactive elements. Zirconium is a non-radioactive element.
Uranium is a naturally occurring radioactive metal that is found in rocks and soil. It is used in nuclear power plants and nuclear weapons.
Thorium is a naturally occurring radioactive metal that is found in rocks and soil. It is used in some nuclear power plants.
Plutonium is a man-made radioactive metal that is used in nuclear weapons.
Zirconium is a non-radioactive metal that is used in a variety of applications, including jewelry, medical implants, and nuclear reactors.