Plutonium is a radioactive chemical element with the symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states.

Is plutonium a gas liquid or solid?

Plutonium is a chemical element with symbol Pu and atomic number 94. Classified as an actinide, Plutonium is a solid at room temperature.

Why is plutonium named after Pluto?

Plutonium was named after the planet, Pluto. This is because it came after Uranium, which was named after the planet Uranus, and neptunium, which was named after the planet Neptune. Plutonium emits neutrons, beta particles and gamma rays.