- columbia, district of,
- columbus air force base,
- columbus day,
- columbus, christopher
Origin of columbium
Examples from the Web for columbium
Chemically related to vanadium are the two elements tantalum and columbium or niobium.
Columbium pentoxide (columbic acid), Cb2O5, is obtained from columbite, after the removal of tantalum (see above).
Columbium pentafluoride, CbF5, is obtained when the pentoxide is dissolved in hydrofluoric acid.
Columbium is a metal closely resembling tantalum and tantalum found a use as electric light filaments.Creative Chemistry|Edwin E. Slosson
Columbium was discovered in a mineral sent from Massachusetts in North America.The Mosaic History of the Creation of the World|Thomas Wood