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
Silvery-throated jay Silvery-throated jay The silvery-throated jay ("Cyanolyca argentigula") is a species of bird in the family Corvidae. It is found in Costa Rica and Panama where its natural habitat is subtropical or tropical moist montane forests. The IUCN has rated its conservation status as being of "least concern". The silvery-throated jay is a distinctive small jay, unlikely to be confused with any other bird found within its range. The sexes are similar, with the adult being about in length including the long tail. The head is black with a narrow but obvious white supercilium, and it bears an inconspicuous crest of