GROUP 7
VANADION.....NIOBION.......PRASEON......TANTALON
VANADIUM......NIOBIUM....PRASEODYMIUM....TANTALUM
THE CORROSION and SHOCK RESISTANT
                                  STEEL PLATING and ALLOY METALS         
THESE METALS ARE USED TO MAKE,  
RAILROAD RAILS
GANTRY CRANES
ELECTRO-PLATED TOOLS
ELECTRICAL POWER RECTIFIERS
       THEIR CLORIDES and OCSIDES ARE USED AS
       COLORANTS IN PRINTERS INKS and WOOD STAINS