Ia Lithium, sodium and potassium
Ib Copper, silver and gold
lIa Calcium, strontium, barium and radium
lIb Beryllium, magnesium, zinc, cadmium and mercury
IIIb Boron and aluminium (gallium, indium)
IVa Titanium, zirconium, cerium and rare earth elements, and thorium
IVb Carbon, silicon, tin and lead
Va Vanadium, niobium and tantalum
Vb Nitrogen, phosphorus, arsenic, antimony and bismuth
VIa Chromium, molybdenum, tungsten and uranium
VIb Sulphur, selenium and tellurium
VIla Manganese and rhenium
Vllb Fluorine, chlorine, bromine and iodine
Vllb Iron, cobalt and nickel
VIIIb Ruthenium, rhodium, palladium, osmium, iridium and platinum
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