Iron, lead, zinc, tin and copper
Aluminium, nickel, scandium, titanium and vanadium
Chromium, manganese, cobalt, yttrium and zirconium
Molybdenum, technetium, ruthenium and rhodium
Cadmium, lutetium, hafnium, tantalum and tungsten
Iridium, gallium, indium, thallium and barium
Caesium, strontium, rubidium and calcium
Potassium, magnesium, sodium and lithium
Niobium, osmium, rhenium and palladium