Gadolinium is a chemical element with the symbol Gd and atomic number 64. It is a silvery-white metal that belongs to the lanthanide series of the periodic table. Gadolinium is known for its high magnetic susceptibility, making it useful in various applications, including magnetic resonance imaging (MRI) and as a contrast agent in medical imaging. In addition to its medical uses, gadolinium is also employed in the production of strong permanent magnets and in nuclear reactors. It has unique properties that allow it to absorb neutrons, which is beneficial in controlling nuclear reactions. Gadolinium is typically found in minerals such as bastnäsite and monazite.