Ключевые слова: actinium, cerium, chemical, chemistry, concept, dysprosium, earth, element, elementary, erbium, europium, gadolinium, germanium, group, holmium, industry, information, investment, laboratory, lanthanum, lutetium, manufacturing, material, metal, mineral, neodymium, nickel, number, ore, periodic, periodic table, praseodymium, promethium, rare, samarium, scandium, science, scientific, substance, supply, technology, tellurium, terbium, thulium, transition, trend, uranium, valuable, ytterbium, yttrium,