Ключевые слова: abstract, atom, background, ball, biology, blue, cell, chemical, chemistry, circle, clip art, concept, connection, drawing, education, electron, element, ellipse, green, icon, illustration, isolated, macro, molecular, molecule, neutron, nobody, nuclear, object, objects, orbiting, particle, photo realistic, physics, power, research, scientific, shape, small, sphere, structure, symbol, technology, turning, white, white background,