What is Palladium? February 23, 2006Posted by Jill Renee in : Jewelry, Palladium Jewelry , trackback
Palladium is a chemical element with symbol Pd and atomic number 46. A rare silver-white transition metal of the platinum group, palladium resembles platinum chemically and is extracted from some copper and nickel ores. It is primarily used as an industrial catalyst and in jewelry.
Palladium is a soft steel-white metal that resembles platinum, doesn’t tarnish in air, and is the least dense and has the lowest melting point of the platinum group metals. It is soft and ductile when annealed and greatly increases its strength and hardness when it is cold-worked. Palladium is chemically attacked by sulfuric and nitric acid but dissolves slowly in hydrochloric acid. This metal also does not react with oxygen at normal temperatures.
This metal has the uncommon ability to absorb up to 900 times its own volume of hydrogen at room temperatures. It is thought that this possibly forms palladium hydride – PdH2 – but it is not yet clear if this is a true chemical compound.