rhodium -
A metallic chemical element symbol Rh with an atomic number of 45.
Wikipedia
Rhodium is a chemical element that is a rare, silvery-white, hard and chemically inert transition metal and a member of the platinum group. It has the chemical symbol Rh and atomic number 45. Naturally-occurring rhodium is composed of only one isotope, Rh.
OmegaWiki Dictionary
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rhodium Chemical element with symbol Rh and atomic number 45, silvery white transition metal.