[roh-dee-uh
m] 
| a silvery-white metallic element of the platinum family, forming salts that give rose-colored solutions: used to electroplate microscopes and instrument parts to prevent corrosion. Symbol: Rh; atomic weight: 102.905; atomic number: 45; specific gravity: 12.5 at 20°C. |
| rho·di·um (rō'dē-əm) n. Symbol Rh A hard, durable, silvery-white metallic element that is used to form high-temperature alloys with platinum and is plated on other metals to produce a durable corrosion-resistant coating. 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 Table at element. [Greek rhodo-, rhodo- + -ium.] |
rhodium rho·di·um (rō'dē-əm)
n.
Symbol Rh
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
Symbol Rh 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. |