Rhodium | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Rhodium


00:01:26 1 History
00:03:07 2 Characteristics
00:03:44 2.1 Chemical properties
00:05:01 2.2 Isotopes
00:06:28 3 Occurrence
00:06:51 3.1 Mining and price
00:09:02 3.2 Used nuclear fuels
00:09:42 4 Applications
00:10:30 4.1 Catalyst
00:11:19 4.2 Ornamental uses
00:12:26 4.3 Other uses
00:13:51 5 Precautions
00:15:04 6 See also



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SUMMARY
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Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, corrosion-resistant and chemically inert transition metal. It is a noble metal and a member of the platinum group. It has only one naturally occurring isotope, 103Rh. Naturally occurring rhodium is usually found as the free metal, alloyed with similar metals, and rarely as a chemical compound in minerals such as bowieite and rhodplumsite. It is one of the rarest and most valuable precious metals.
Rhodium is found in platinum or nickel ores together with the other members of the platinum group metals. It was discovered in 1803 by William Hyde Wollaston in one such ore, and named for the rose color of one of its chlorine compounds, produced after it reacted with the powerful acid mixture aqua regia.
The element's major use (approximately 80% of world rhodium production) is as one of the catalysts in the three-way catalytic converters in automobiles. Because rhodium metal is inert against corrosion and most aggressive chemicals, and because of its rarity, rhodium is usually alloyed with platinum or palladium and applied in high-temperature and corrosion-resistive coatings. White gold is often plated with a thin rhodium layer to improve its appearance while sterling silver is often rhodium-plated for tarnish resistance.
Rhodium detectors are used in nuclear reactors to measure the neutron flux level.