niobium - Dictionary definition and pronunciation - Yahoo! Education
Reference
Dictionary
Encyclopedia
Thesaurus
World Factbook
Spanish Dictionary
Anatomy
Conversion Calculator
 
ni·o·bi·um  audio  (n-b-m) KEY 

NOUN:
Symbol Nb
A silvery, soft, ductile metallic element that occurs chiefly in columbite-tantalite and is used in steel alloys, arc welding, and superconductivity research. Atomic number 41; atomic weight 92.906; melting point 2,468°C; boiling point 4,927°C; specific gravity 8.57; valence 2, 3, 5. See Table at element.
ETYMOLOGY:
After Niobe ( so called because it is extracted from tantalite)


 Visit our partner's site
Provided by Houghton Mifflin
logoeReference -- Download this interactive reference software to your desktop computer