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
Locations in the United States with an English name spelling of an English place (in this case Hertford). The American capital Washington, D.C. is named after the first U.S. President George Washington, whose surname was due to his family holding land in Washington, County Durham. • The state itself is named after a rural village in Cornwall. Locations in the United States with an English name A large number of places in the U.S were named after places in England largely as a result of English settlers and explorers of the Thirteen Colonies. Some names were carried over directly and are found throughout the country (such as Manchester, Birmingham