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Atomic symbol Rh
Atomic number 45
Classification Transition Metals
Atomic mass 102.9055 amu
Other Information
Date of discovery 1803
Name of discoverer William H. Wollaston
Name origin From the Latin rhodon, meaning rose, as its diluted salts produce a rosy solution.
Uses Used as a coating to prevent wear on high quality science equipment as well as in headlight reflectors, telephone relays, fountain pen tips and aircraft sparkplugs.
Obtained from Produced as a by-product of nickel refining, but is also found in its natural state in Montana, USA.

Rhodium(RO-dee-em) is a hard, silvery metal.

Additional Properties

Melting Point: 3567 °F (1964 °C or 2237 K)

Boiling Point: 6683 °F (3695 °C or 3968 K)

Density: 12.4 grams per cubic centimeter[1]


The primary use for Rhodium is in catalytic converters for cars.[2]

See also