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- Name : Palladium
- Symbol : Pd
- Atomic # : 46
- Atom weight: 106.42
- Melting P. : 1554
- Boiling P. : 3140
- Oxidation : +2, +4
- Pronounced : peh-LAY-di-em
- From : Named after the asteroid, Pallas
- Identified : William Hyde Wollaston in 1803
- Appearance : Silvery-white, soft, malleable and ductile metal
- Note : Used in dental items, analog watches and jewelry
-
- [Properties]
-
- Palladium is described as a silver-white metal that is both ductile and
- malleable. Because of the latter features, it is often found as a
- substitute for silver in electrical components, jewelry, and dental
- materials. Palladium is one of the Group-VII transition metals.
- Palladium is more prone to attack from common acids than the other
- platinum metals (rhodium iridum, ruthenium, and osmium, for example).
- Whereas the other platinum metals hardly respond at all to hydrochloric
- acid at room temperature, one of palladium's most useful compounds,
- palladium (II) chloride, is produced by the reaction between palladium
- metal and hydrochloric acid.
- All metals soften somewhat at temperatures just a bit below their melting
- point. Palladium, however, softens over an unusually wide range of
- temperatures below the melting point. As far as practical applications are
- concerned this means palladium is easy to weld.
- Palladium has an ability to absorb large amounts of hydrogen - up to
- 900 times its own volume.
- Palladium is found in conjuction with platinum, nickel, copper, and gold.
- The method for extracting the palladium depends mainly on the metal it
- accompanies to the refinery.
-