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rhodium
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rhodium

Hard, silver-white, metallic element, atomic number 45, relative atomic mass 102.905. It is one of the so-called platinum group metals and is resistant to tarnish, corrosion, and acid. It occurs as a free metal in the natural alloy osmiridium and is used in jewellery, electroplating, and thermocouples.

Rhodium was discovered 1803 by English chemist William Wollaston and named in 1804 for the red colour of its salts in solution.
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