Ключевые слова: 3d, abundant, acids, amino, atmosphere, atom, atomic, chemistry, compounds, crystalline, design, earth, education, educational, electron, element, glossy, graphic, illustration, isotopes, mass, matter, mendeleev, mineral, name, neutrons, nonmetal, periodic, phosphate, physics, plastic, poster, protons, push, rocks, s, school, science, sign, solid, sulfur, switch, symbol, system, table, universe, weight, white,