Ключевые слова: abstract, atom, atomic, backdrop, background, biology, chemical, chemistry, chromium, concept, copper, creative, design, education, element, gas, gold, graphic, group, helium, hydrogen, icon, illustration, information, label, mendeleev, microbiology, molecular, molecule, nickel, organization, oxygen, periodic, poster, research, science, scientific, shape, sign, silver, smoke, structural, substance, symbol, system, table, technology, weight, white,