Thorium is a chemical element; it has symbol Th and atomic number 90. Thorium is a weakly radioactive light silver metal which tarnishes olive grey when it is exposed to air, forming thorium dioxide; it is …

Nov 11, 2025 · thorium (Th), radioactive chemical element of the actinoid series of the periodic table, atomic number 90; it is a useful nuclear reactor fuel. Thorium was discovered (1828) by Swedish …

Element Thorium (Th), Group 20, Atomic Number 90, f-block, Mass 232.038. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Jun 4, 2024 · Thorium is a silvery-white, slightly radioactive metal with the symbol Th and atomic number 90. It is an element the actinide series and f-block of the periodic table. Thorium takes its …

Explore an in-depth guide on Thorium, a radioactive element with promising applications in nuclear energy. Learn about its properties, industrial uses, medical applications, and safety precautions. …

Discovered in 1829, thorium is a naturally occurring radioactive metal with no stable isotopes. It is about as abundant as lead. Soil commonly contains an average of about six parts of thorium per million …

Aug 7, 2025 · Thorium is a little-known element with a rich scientific history and its growing relevance today. Named after the Norse god of thunder, it has played a role in everything from 19th-century …

Thorium is a chemical element; it has symbol Th and atomic number 90. Thorium is a weakly radioactive light silver metal which tarnishes olive grey when it is exposed to air, forming thorium dioxide; it is …

Thorium was discovered by Jöns Jacob Berzelius in 1828, in Stockholm, Sweden after he received a sample of an unusual black mineral from Hans Esmark found on an island close to Brevik, Norway.

Much of the internal heat the earth has been attributed to thorium and uranium. When pure, thorium is a silvery white metal which is air-stable and retains its lustre for several months.