Lithium, beryllium, sodium
Magnesium, aluminum, potassium
Calcium, scandium, titanium
Vanadium, chromium, manganese
Iron, cobalt, nickel
Copper, zinc, gallium
Germanium, arsenic, selenium
Bromine, krypton, rubidium
Strontium, yttrium, zirconium
Niobium, molybdenum, technetium
Ruthenium, rhodium, palladium
Silver, cadmium, indium
Tin, antimony, tellurium
Iodine, xenon, cesium
Barium, lanthanum, cerium
Praseodymium, neodymium, promethium
Samarium, europium, gadolinium
Terbium, dysprosium, holmium
Erbium, thulium, ytterbium
Lutetium, hafnium, tantalum
Tungsten, rhenium, osmium
Iridium, platinum, gold
Mercury, thallium, lead
Bismuth, polonium, astatine
Radon, francium, radium
Actinium, thorium, protactinium
Uranium, neptunium, plutonium
Americium, curium, berkelium
Californium, einsteinium, fermium
Mendelevium, nobelium, lawrencium