There are six naturally occurring stable isotopes of palladium, the most common of which has 60 neutrons. Palladium has 46 protons, and its atomic number is therefore 46. Its chemical symbol is Pd.
27.33 percent of naturally occurring palladium is Palladium-106, which has 60 neutrons. 26.46 percent is Palladium-108 with 62 neutrons, 22.33 percent is Palladium-105 with 59 neutrons, 11.72 percent is Palladium-110 with 64 neutrons, 11.14 percent is Palladium-104 with 58 neutrons and 1.02 percent is Palladium-102 with 56 neutrons.
Palladium was named after the asteroid Pallas by its discoverer William Hyde Wollaston in 1803. It is a white-silvery metal and is usually obtained from nickel, platinum, silver, and copper ores as a byproduct of the mining process.
A rare element, palladium reacts with chlorine to form the compound palladium II chloride which is used in carbon monoxide detectors. Palladium is commonly used as a catalyst and also has applications in watchmaking, jewelry, dentistry, electrical contacts and ceramic capacitors.