Plutonium – $4 Million/Kg

Known for its use in the production of energy for nuclear weapons and spacecraft fuel, this radioactive metal ranks high up in price. Plutonium was named after the planet Pluto and was first produced and separated in 1940. It was then used to cause the atomic ravage in Nagasaki during World War II. Today, plutonium is still an invaluable munition for the military.

The reactive chemical is only found in trace amounts in uranium ores making it a rare and coveted substance. It is also a byproduct of the nuclear power industry. So, the substance is a radiological hazard and should be handled with caution using specialized equipment.