Terbium is a chemical element with the symbol Tb and atomic number 65. It is a rare earth metal that belongs to the lanthanide series on the periodic table. Terbium is silvery-gray in color and is known for its high melting point and resistance to corrosion. It is primarily used in various applications, including phosphors for LED lights and as a dopant in solid-state devices. This element is typically found in minerals such as monazite and xenotime. Terbium is not found in its pure form in nature due to its reactivity, but it can be extracted through chemical processes. Its unique properties make it valuable in the electronics and energy sectors.