columbium pentafluoride, CbF5, is obtained when the pentoxide is dissolved in hydrofluoric acid.
columbium was discovered in a mineral sent from Massachusetts in North America.
columbium is a metal closely resembling tantalum and tantalum found a use as electric light filaments.
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).