Iggy's Element Bonanza! Element: Palladium Atomic Symbol: Pd Atomic Number: 46 Iggy: Palladium is a rare and has the lowest melting point of the Platinum Group Metals. It is primarily used in catalytic converters in cars and it has properties similar to its congener, Nickel. Palladium has six stable isotopes, Pd-102, Pd-104, Pd-105, Pd-106, Pd-110 and Pd-107 with a half-life of 6.5 million years.