tórium
Thorium is a chemical element with the symbol Th and atomic number 90. It is an actinide metal that is naturally occurring and radioactive. Thorium is found in small amounts in most rocks and soils, and is more common than uranium. It is a silvery-white metal that tarnishes in air, forming a black oxide.
Thorium was discovered in 1828 by the Swedish chemist Jöns Jacob Berzelius. He named it after Thor,
The most stable isotope of thorium is thorium-232, which has a half-life of 14 billion years. Thorium-232
Thorium's potential as a nuclear fuel is attributed to its abundance and the fact that it can