Ключевые слова: active, alert, app, atom, atomic, attention, background, biological, black, bomb, button, caution, chemical, chemistry, computer, danger, dangerous, design, element, energy, hazard, hazardous, icon, illustration, industry, isolated, nuclear, phone, power, radiation, radioactive, radioactivity, recycling, risk, sign, symbol, toxic, uranium, war, warning, web, www,