Rhodium (pronounced /roudiam /ROH-dee-am) is a chemical element that is a rare, silvery-white, hard and chemically inert transition metal and a member of the platinum group. It has the chemical symbol Rh and atomic number 45. Naturally occurring rhodium is composed of only one isotope, 103Rh. It is one of the rarest percious metals and, with a price of about US$ 80,000/kg in 2010, is the most expensive member of that class.
Rhodium was discoveredi in 1803 by William Hyde Wollaston. It is found in platinum ores and is mostly used as a catalyst. Because of its rarity, rhodium is usually alloyed with platinum or palladium and applied in high-temperature and corrosion-resistive coatings. Rhodium detectors are used in nuclear reactors to measure the neutron flux level.
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