Rhodium Properties, Molecular Formula, Applications - WorldOfChemicals

Rhodium Properties




Rhodium is a chemically inert transition metal and a member of the platinum group. Naturally-occurring rhodium is found as the free metal, alloyed with similar metals, and never as a chemical compound. It is one of the rarest precious metals, and the most costly. 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 is as one of the catalysts in the three-way catalytic converters of 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 optical impression while sterling silver is often rhodium plated for tarnish resistance. Rhodium detectors are used in nuclear reactors to measure the neutron flux level.

Chemical Properties

Appearance Silvery White Metallic Solid
Atomic Number 45
Atomic Weight 102.9055 g/mol
Block d
Boiling Point 3695 °C
CAS Number 7440-16-6
Class 4.1
Crystal Structure Face-Centered Cubic
Density 12.41 g/cm3
EINECS Number 231-125-0
Electron Configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 4d8
Group 9
Ionization Energy 719.7 KJ/mol
Melting Point 1964 °C
Oxidation State 6,5,4,3,2,1,-1
PG 3
Period 5
RTECS Number VI9069000
Symbol Rh
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