Palladium is a rare metallic element of the platinum group. It is silver-white, ductile, and malleable. Found in nickel and gold ores, it is used chiefly as catalyst and in dentistry, surgical instruments, and other alloys. It has a melting point of 1,551ºC. Symbol Pd; Atomic number 46; atomic weight 106.4; valence 2, 3, 4.