Ключевые слова: abstract, art, atomic, atoms, basic, black, bond, chemical, chemistry, clean, clip, compound, concept, design, dihydrogen, editable, education, electron, element, energy, environmental, fuel, gas, graphic, h2, hydrogen, icon, iconography, illustration, line, minimalist, model, modern, molecular, molecule, physics, renewable, research, science, scientific, simple, stem, structure, symbol, technology, two, white,