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Palladium is a chemical element with the symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. It is named after the asteroid Pallas, which was discovered in 1802. Palladium is a member of the platinum group metals (PGMs), and is used in a variety of applications, including jewellery, dentistry, and electronics.