Palladium Palladium Palladium is a chemical element with symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. More than half the supply of palladium
Earth (classical element) by a horizontal line. Prithvi (Sanskrit: ', also ') is the Hindu "earth" and mother goddess. According to one such tradition, she is the personification of the Earth itself; according to another, its actual mother, being "Prithvi Tattwa", the essence of the element earth. As "Prithvi Mata", or "Mother Earth", she contrasts with "Dyaus Pita", "father sky". In the Rigveda, "earth" and sky are frequently addressed as a duality, often indicated by the idea of two complementary "half-shells." In addition, the element Earth is associated with Budha or Mercury who represents communication, business, mathematics and other practical matters. Earth and