Chemical elements
  Rhodium
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    Chemical Properties
    PDB 165d-454d

Element Rhodium, Rh, Transition Metal





History

Rhodium was discovered in 1803 by William Hyde Wollaston, soon after his discovery of palladium. Wollaston dissolved raw platinum in aqua regia. The acid surplus was neutralized by caustic soda. He then precipitated the platinum by adding ammonium chloride, NH4Cl; palladium was removed as palladium cyanide after treating the solution with mercuric cyanide. The material that remained was a red powder double (rhodium) chloride. Rhodium metal was isolated by roasting via reduction with hydrogen gas. Rhodium derived from Greek rhodon meaning "rose", because of the color of rhodium chloride solution.


Occurrence

Rhodium crustal abundance is 1x10-7% by mass. It makes solid solutions with platinum group of metals; it is also contained in native platinum and osmium-iridium minerals. Rhodium may be also found in sulphuric, arsenic and antimonous platinum compounds, which accompany copper-nickel ores. Rhodium abundance in raw material varies from 0.2% in nickel minerals to 11.3% in Rhodium nevyanskite.

Rhodium is a very rare transition metal, only several tons. Principal sources of this element are located in South Africa, in river sands of the Ural Mountains, in North and South America and also in the copper-nickel sulfide mining area of the Sudbury, Ontario region. Demand for rhodium increases on 20% annually.

Neighbours



Chemical Elements

26Fe
55.8
Iron
27Co
58.9
Cobalt
28Ni
58.7
Nickel
44Ru
101.1
Ruthenium
45Rh
102.9
Rhodium
46Pd
106.4
Palladium
76Os
190.2
Osmium
77Ir
192.2
Iridium
78Pt
195.1
Platinum

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