Ключевые слова: actinides, atoms, backdrop, background, banner, calcium, carbon, concept, copper, country, design, education, elements, emblem, flag, gases, graphic, halogens, illustration, information, magnesium, marketing, material, metals, nation, noble, numbers, oxygen, periodic, physics, poster, reative, school, science, scientific, silicon, solid, symbol, symbols, table, technology, template, tunisia, wallpaper, xenon,