|a hard corrosion-resistant silvery-white element of the platinum metal group, occurring free with other platinum metals in alluvial deposits and in nickel ores. It is used as an alloying agent to harden platinum and palladium. Symbol: Rh; atomic no: 45; atomic wt: 102.90550; valency: 2--6; relative density: 12.41; melting pt: 1963±3°C; boiling pt: 3697±100°C|
|[C19: New Latin, from Greek rhodon rose, from the pink colour of its compounds]|
rhodium rho·di·um (rō'dē-əm)
A hard durable metallic element. Atomic number 45; atomic weight 102.905; melting point 1,964°C; boiling point 3,700°C; specific gravity 12.41; valence 2, 3, 4, 5, 6.
|rhodium (rō'dē-əm) Pronunciation Key
A rare, silvery-white metallic element that is hard, durable, and resistant to acids. It is used as a permanent plating for jewelry and is added to platinum to make high-temperature alloys. Atomic number 45; atomic weight 102.905; melting point 1,966°C; boiling point 3,727°C; specific gravity 12.41; valence 2, 3, 4, 5, 6. See Periodic Table.