Group: Vanadium group

All metals from the vanadium group (5th subgroup) have similar chemical properties. Niobium and tantalum were formerly referred to as acidic earths or earth acids because of their character as acid formers.

23V
Vanadiumblue-silver-grey metal
41Nb
Niobiumgray metallic, bluish when oxidized
73Ta
Tantalumgray blue