Dictionary
ru•the•ni•um
Pronunciation: (rOO-thē'nē-um, -thēn'yum), [key]—
n. Chem.
a steel-gray, rare metallic element, belonging to the platinum group of metals.
Symbol: Ru;
at. wt.: 101.07;
at. no.: 44;
sp. gr.: 12.2 at 20°C.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.