INTRODUCTION. SCANDIUM, YTTRIUM, LANTHANUM, LANTHANOIDE and ACTINOIDE ELEMENTS. TITANIUM, ZIRCONIUM and HAFNIUM. VANADIUM, NIOBIUM and TANTALUM. CHROMIUM, MOLYBDENUM and TUNGSTEN. MANGANESE, TECHNETIUM and RHENIUM. IRON, RUTHENIUM and OSMIUM. COBALT, RHODIUM and IRIDIUM. NICKEL, PALLADIUM and PLATINUM. COPPER, SILVER and GOLD. ZINC, CADMIUM and MERCURY. OVERVIEW and CONCLUDING REMARKS.