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 grebe Silvery grebe The silvery grebe ("Podiceps occipitalis") is a species of grebe in the family Podicipedidae. It is found in the western and southern part of South America at altitudes of up to . Its natural habitat is freshwater lakes but it also feeds in saline lakes. The silvery grebe is about in length. There are two different subspecies which differ in the colouring on their head and facial plumes. The southern form has a black cap and the sides of its head are grey. The neck, chest and belly are white while the back is dark grey and the