Thorium
Thorium is a chemical element in actinide group. It is a weakly radioactive metal. It has a shiny, silvery white color. It has the chemical symbol Th and the atomic number 90. Natural thorium has an atomic weight of 232. Thorium is named after Thor, the Norse god of thunder. Its ores are found in nature (that is, on Earth), especially in India, the United States, and Australia.